Feeling very sorry for something that you have done wrong at past, why? Because you mightn't or might know how to do that. A feel what is cause of your suffering in future. A feel which deal with you conscience. A feel that eats you like a worm.
Conscience-Stricken is a purify process, which helps you to be in Love, instead of hatE. In my opinion, in conscience-stricken state, your conscience is trying to be free from bad points that are made by hate; and this is enough to have Love.
Lord! Give us weak eyes for things of no account, and eyes of full clarity in all your truth.
Soren Kierkegaard - The Sickness unto Death