He's feeling very remorseful,

He was remorseful of what he did.

He's not remorseful,

I am much chastened and profoundly remorseful.

I have lots of grouchy plants though.

another person might have been unjustly prosecuted, and for other reasons which I can't explain at this time, but will become evident in the course of time, it was his firm instructions to me that he wished to get this matter over with.