All of the gifts we have received from God, all of our talents, abilities and blessings, are given to us that we may put them at the service of our brothers and sisters. This is what it means to sacrifice our lives for one another and to love as Jesus has loved us.
We tend to think of a prophet as one who predicts the future, but that is not at all the ancient understanding of the word. The word "prophet" means speaker, or one who speaks. In Christian use, a prophet is one who has a special connection to God and speaks on God's behalf.
By virtue of our Baptism we are invested in the threefold office of Christ, priest, prophet, and king. The degree to which we fulfill each of these offices will depend on our individual gifts and calling. We are all called to be prophets, as well as priests and kings, to the degree our gifts allow us.