Matthew Poole and continuators on Jeremiah 20:9

9 Then I said, I will not make mention of him, nor speak any more in his name . But his word was in my heart as a burning fire shut up in my bones, and I was weary with forbearing, and I could not stay .

This daily scorn and reproach which the Prophet saw himself exposed unto, for preaching against the sin and wickedness of the people, was a sore Temptation upon him to lay down his imployment as a Prophet, he did not speak this openly, but he spake it in his heart, he had (as he confesseth) many such thoughts in his breast.

But he saith he was not able to do what he thought to do, he found in his heart a constraint to go on, that when a Revelation came at any time from God unto him it was like a fire in his bones which he must quench, by uttering what God had revealed to him.

Marginal references: Psal. 39.3.; Job 32.18.