For he whom God has sent utters the words of God (Jn 3:34a ESV)
These words are part of the testimony of John the Baptist about Jesus, nevertheless they apply to anyone sent of God. For as Jesus himself said: As the Father has sent me, even so I am sending you (Jn 20:21). Indeed this verse represents the very essence of what it is to be the Church of Jesus. The two irreducible things we must always be is: sent and speaking. Or to put it another way: apostolic and prophetic. The foundational ministries for the church are Apostles and Prophets (Eph 2:20). There is no dichotomy between God's plan for an apostolic church, and his will for a prophetic people - they are one and the same. To be apostolic we must be prophetic; to be prophetic we must be apostolic. To speak the words of God we must be sent, and if we are sent then we are sent with the word of God.
This is also a great promise, a guarantee, that if we go where and when we are sent, then he will also give us his words to speak. The end of the verse tells us not only how, but when and where:
for he gives the Spirit without measure.
Without limitation! We are God's apostolic and prophetic people wherever we go, and whenever we are there. We are sent with something to say!