Charles Spurgeon Commentary Jeremiah 1:4-6

"Now the word of Jehovah 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; I have appointed thee a prophet unto the nations. Then said I, Ah, Lord Jehovah! behold, I know not how to speak; for I am a child." — Jeremiah 1:4-6 (ASV)

He was only young, and when young men are called to be ambassadors for God, they ought to feel the weight of the responsibility that rests upon them, and to be conscious of their lack of experience, and of their lack of fitness for the work. In that consciousness of unfitness, there often lies the evidence of their fitness for the task entrusted to them. Perhaps, out of weakness they will be made strong; but if they do not feel their weakness, they are not likely to cry to God for help, or to receive it from him.

"Ah, Lord God!" said young Jeremiah, "behold, I cannot speak: for I am a child."