The prophet who speaks on behalf of God must first listen to the voice of God. He should open himeslf to the divine voice to understand the message which he has to proclaim to the people.
In todays society, the Word of God (Holy Scripture) is the most effective media which brings the divine voice to us. As same as that, different people are helping us to identify the divine voice; they are Priests, Religious, Parents, and teachers. Even the signs of the time are also helpful to us to find the divine voice.
A Prophet who speaks on behalf of God is bound with responsibility to speak what God wants, but not what he wants. Therefore prophet receives a vocation to hand over the God's plan to people.
Through Baptism, all of us had been anointed to be the prophets in the Church. It is very difficult to witness to this prophetic call, but we can be strengthened and be active with the power of God. According to that the responsibilities mentioned below were given us to follow.