Amaleki's last counsel to us, at the end of the plates of Nephi to believe in the Gifts.
"And it came to pass that I began to be old; and, having no seed, and knowing king Benjamin to be a just man before the Lord, wherefore, I shall deliver up these plates unto him, exhorting all men to come unto God, the Holy One of Israel, and believe in prophesying, and in revelations, and in the ministering of angels, and in the gift of speaking with tongues, and in the gift of interpreting languages, and in all things which are good; for there is nothing which is good save it comes from the Lord: and that which is evil cometh from the devil." (Omni 1:25)
This mirrors what Mornoni's last counsel to us was at the end of the Book of Mormon in Moroni 10 Both prophets, ending the records pressed how important these things are. What could be more important than recognizing we don't have gifts, and if that is our awful case, then offering our whole soul as an offering (to the Lord himself, and not an intermediary) and recieving that which he desires to bestow?
If angels cease to appear, or gifts of the Spirit or miracles cease it's because of unbelief and all is vain.
"...has the day of miracles ceased? Or have angels ceased to appear unto the children of men? Or has he withheld the power of the Holy Ghost from them? Or will he, so long as time shall last, or the earth shall stand, or there shall be one man upon the face thereof to be saved? Behold I say unto you, Nay; for it is by faith that miracles are wrought; and it is by faith that angels appear and minister unto men; wherefore, if these things have ceased wo be unto the children of men, for it is because of unbelief, and all is vain." (Moroni 7:35-37)
"...have miracles ceased? Behold I say unto you, Nay; neither have angels ceased to minister unto the children of men. For behold, they are subject unto him, to minister according to the word of his command, showing themselves unto them of strong faith and a firm mind in every form of godliness." (Moroni, Moroni 7:30)
Do angels minister to those who have already received the Second Comforter. Does the Second Comforter come first?
"Yea, he has undertaken a greater work; therefore I will make him [John] as flaming fire and a ministering angel; he shall minister for those who shall be heirs of salvation who dwell on the earth." (D&C 7:6)
"Are they [angles] not all ministering spirits, sent forth to minister for them who shall be heirs of salvation?" (Heb 1:14)
Here an heir of salvation is defined as one who will inherit any degree of glory.
"And also the telestial receive it of the administering of angels who are appointed to minister for them, or who are appointed to be ministering spirits for them; for they shall be heirs of salvation." (D&C 76:88)
"When about midway during the prayer, there was a glorious sensation passed through the house [Kirtland Temple]; and we, having our heads bowed in prayer, felt a sensation very elevating to the soul. At the close of the prayer, F. G. Williams being in the upper east stand- -Joseph being in the speaking stand next below--rose and testified that midway during the prayer an holy angel came and seated himself in the stand. When the afternoon meeting assembled, Joseph, feeling very much elated, arose the first thing and said the personage who had appeared in the morning was the Angel Peter come to accept the dedication." (Angell, Truman O. Autobiography of Truman O. Angell)
"During the ceremonies of the dedication an angel and sat near President Joseph Smith Sen. and Frederick G Williams so that they had a fair view of person He was a very tall personage black eyes hair and stoop shouldered his garment was whole to near his ankles on his feet he had sandals He was sent as a messenger to accept of the dedication." (Heber C. Kimball, Life of Heber C. Kimball, By Orson Ferguson Whitney)
Two or three days after the Kirtland Temple dedication “...the beloved disciple John was seen in our midst by the Prophet Joseph, Oliver Cowdery, and others.” (Orson F. Whitney, Life of Heber C. Kimball)
Mary Lightner and Joseph describes angellic visitor when she prayed concerning Joseph's proposal of marriage
"I made it a subject of prayer and I worried about it because I did not dare to speak to a living being except Brigham Young. I went out and got between three haystacks where no one could see me. As I knelt down I thought, why not pray as Moses did? He prayed with his hands raised. When his hands were raised, Israel was victorious, but when they were not raised, the Philistines were victorious. I lifted my hands and I have heard Joseph say the angels covered their faces. I knelt down and if ever a poor mortal prayed, I did. A few nights after that an angel of the Lord came to me and if ever a thrill went through a mortal, it went through me. I gazed upon the clothes and figure but the eyes were like lightning. They pierced me from the crown of my head to the soles of my feet. I was frightened almost to death for a moment. I tried to waken my aunt, but I could not. The angel leaned over me and the light was very great, although it was night. When my aunt woke up she said she had seen a figure in white robes pass from our bed to my mother's bed and pass out of the window.
"Joseph came up the next Sabbath. He said, ‘Have you had a witness yet?’ ‘No.’ ‘Well,’ said he, ‘the angel expressly told me you should have.’ Said I, ‘I have not had a witness, but I have seen something I have never seen before. I saw an angel and I was frightened almost to death. I did not speak.’ He studied a while and put his elbows on his knees and his face in his hands. He looked up and said, ‘How could you have been such a coward?’ Said I, ‘I was weak.’ ‘Did you think to say, 'Father, help me?'‘ ‘No.’ ‘Well, if you had just said that, your mouth would have been opened for that was an angel of the living God. He came to you with more knowledge, intelligence, and light than I have ever dared to reveal.’ I said, ‘If that was an angel of light, why did he not speak to me?’ ‘You covered your face and for this reason the angel was insulted.’ Said I, ‘Will it ever come again?’ He thought a moment and then said, ‘No, not the same one, but if you are faithful you shall see greater things than that.’ And then he gave me three signs of what would take place in my own family, although my husband was far away from me at the time. Every work came true. I went forward and was sealed to him. Brigham Young performed the sealing, and Heber C. Kimball the blessing." (Mary Lightner, Address to Brigham Young University, 1905)
"In consequence of these things, I often felt condemned for my weakness and imperfections; when, on the evening of the above-mentioned twenty-first of September, after I had retired to my bed for the night, I betook myself to prayer and supplication to Almighty God for forgiveness of all my sins and follies, and also for a manifestation to me, that I might know of my state and standing before him; for I had full confidence in obtaining a divine manifestation, as I previously had one.
"While I was thus in the act of calling upon God, I discovered a light appearing in my room, which continued to increase until the room was lighter than at noonday, when immediately a personage appeared at my bedside, standing in the air, for his feet did not touch the floor.
"He had on a loose robe of most exquisite whiteness. It was a whiteness beyond anything earthly I had ever seen; nor do I believe that any earthly thing could be made to appear so exceedingly white and brilliant. His hands were naked, and his arms also, a little above the wrist; so, also, were his feet naked, as were his legs, a little above the ankles. His head and neck were also bare. I could discover that he had no other clothing on but this robe, as it was open, so that I could see into his bosom."Not only was his robe exceedingly white, but his whole person was glorious beyond description, and his countenance truly like lightning. The room was exceedingly light, but not so very bright as immediately around his person. When I first looked upon him, I was afraid; but the fear soon left me." (Joseph Smith History)
"And, behold, there was a great earthquake: for the angel of the Lord descended from heaven, and came and rolled back the stone from the door, and sat upon it. His countenance was like lightning, and his raiment white as snow: And for fear of him the keepers did shake, and became as dead men. And the angel answered and said unto the women, Fear not ye: for I know that ye seek Jesus, which was crucified." (Matthew 28:2-5)
"And again, verily I say unto you that it is your privilege, and a promise I give unto you that have been ordained unto this ministry, that inasmuch as you strip yourselves from jealousies and fears, and humble yourselves before me, for ye are not sufficiently humble, the veil shall be rent and you shall see me and know that I am—not with the carnal neither natural mind, but with the spiritual. For no man has seen God at any time in the flesh, except quickened by the Spirit of God. Neither can any natural man abide the presence of God, neither after the carnal mind. Ye are not able to abide the presence of God now, neither the ministering of angels; wherefore, continue in patience until ye are perfected." (D&C 67:10-13)