"And as all have not faith, seek ye diligently and teach one another words of wisdom; yea, seek ye out of the best books words of wisdom; seek learning, even by study and also by faith." (D&C 88:118)
"Be willing to receive the truth, let it come from whom it may; no difference, not a particle. Just as soon receive the Gospel from Joseph Smith as from Peter, who lived in the days of Jesus. Receive it from one man as soon as another. If God has called an individual and sent him to preach the Gospel that is enough for me to know; it is no matter who it is, all I want is to know the truth." (Brigham Young, Discourses of Brigham Young, by John A. Widtsoe, p 17)
Note this first statement is very limited in scope, and the second gives great breadth.
"And thou shalt not command him who is at thy head, and at the head of the church; For I have given him the keys of the mysteries, and the revelations which are sealed, until I shall appoint unto them another in his stead."
"Behold, I say unto thee, Oliver, that it shall be given unto thee that thou shalt be heard by the church in all things whatsoever thou shalt teach them by the Comforter, concerning the revelations and commandments which I have given. But, behold, verily, verily, I say unto thee, no one shall be appointed to receive commandments and revelations in this church excepting my servant Joseph Smith, Jun., for he receiveth them even as Moses. And thou shalt be obedient unto the things which I shall give unto him, even as Aaron, to declare faithfully the commandments and the revelations, with power and authority unto the church. And if thou art led at any time by the Comforter to speak or teach, or at all times by the way of commandment unto the church, thou mayest do it. But thou shalt not write by way of commandment, but by wisdom;" (D&C 28:6-7, 1-5)
"And I give unto you a commandment that you shall teach one another the doctrine of the kingdom." (D&C 88:77)
"And, behold, and lo, this is an ensample unto all those who were ordained unto this priesthood, whose mission is appointed unto them to go forth—And this is the ensample unto them, that they shall speak as they are moved upon by the Holy Ghost. And whatsoever they shall speak when moved upon by the Holy Ghost shall be scripture, shall be the will of the Lord, shall be the mind of the Lord, shall be the word of the Lord, shall be the voice of the Lord, and the power of God unto salvation." (D&C 68:2-4)
"Appoint among yourselves a teacher, and let not all be spokesmen at once; but let one speak at a time and let all listen unto his sayings, that when all have spoken that all may be edified of all, and that every man may have an equal privilege." (D&C 88:122)