1 Corinthians 14.
The essense of prophesy is knowing God and communicating that with others, not in second hand words, but through our own encounter with the living God.
It can be what we say and the way we live. We need to be a prophetic church, hearing and knowing God and sharing that with each other and with those outside.
Prophesy reflects the character of God, it is his spirit that brings life and truth. Prophesy is a gift of God, the ability to communicate his truth in words that people can understand.
Prophesy also requires work: