2 Corinthians 4:6-7

6God is the one who said, ‘Let light shine in the dark.’ And he is the one who has caused his light to shine deep inside us. Because of that, we know how great and powerful God is. We see that his power shines brightly in Christ's face.

7God has given to us the gift to speak his message. But we ourselves are very weak. It is like we are keeping his valuable gift in clay pots. So it is clear that the great power of God's message comes from God himself. It does not come from us.