Deuteronomy 18:18
I will raise up for them a prophet like you from among their brethren; and I will put my words in his mouth, and he shall speak to them all that I command him.
In baptism we are anointed "prophet." We share in Christ's own prophetic office in the world, speaking forth the word of God and sharing in the reward (and brickbats) that a prophet receives. A prophet is not, of course, somebody who goes around predicting the future (though that does rarely happen). A prophet is a mouth. False prophets are mouths for the Spirit of the Age, or Madison Avenue, or sometimes simply themselves. A true prophet is a mouth for God. Today, speak the Word of God and you will be a prophet.