The Holy Ghost removes carnal desires, replaces with desire to do good.
Faith comes by hearing the word of God. (This presupposes the speaker is in possesion of it, or in other words, is speaking by the power of the Holy Ghost)
Gift of prophecy is the hallmark of having the Holy Ghost.
"And they all cried with one voice, saying: Yea, we believe all the words which thou hast spoken unto us; and also, we know of their surety and truth, because of the Spirit of the Lord Omnipotent, which has wrought a mighty change in us, or in our hearts, that we have no more disposition to do evil, but to do good continually.
"And we, ourselves, also, through the infinite goodness of God, and the manifestations of his Spirit, have great views of that which is to come; and were it expedient, we could prophesy of all things.
"And it is the faith which we have had on the things which our king has spoken unto us that has brought us to this great knowledge, whereby we do rejoice with such exceedingly great joy." (King Benjamin, Mosiah 5:2-4)