Jeremiah 26:3

If so be they will hearken
And obey; which is expressive not of ignorance and conjecture in God, but of his patience and long suffering, granting space and time for repentance, and the means of it; which disregarded, leave without excuse: and turn every man from his evil way;
his series and course of life, which was evil, and was the case of everyone; so that as their sin was general, the reformation ought to be so too: that I may repent me of the evil which I purpose to do unto them;
or "am thinking", or "devising ^F4 to do unto them"; which repentance must be understood not of a change of mind, but of the course of his providence towards them, which, by his threatenings, and some steps taken, portended ruin and destruction; yet, in case of repentance and reformation, he would change his method of action agreeably to his will: because of the evil of their doings;
this was the reason why he had threatened them with the evil of punishment, because of the evil of their actions; which were breaches of his law, and such as provoked the eyes of his glory.