the word of the Lord came unto me, saying, Before I formed thee in the belly I knew thee; and before thou camest forth out of the womb I sanctified thee and I ordained thee a prophet unto the nations. Jeremiah 1:4-5
 
I said, I will not make mention of him, nor speak any more in his name. But his word was in mine heart as a burning fire shut up in my bones and I was weary with forbearing, and I could not stay. Jeremiah 20:9