英语语法分析

The thief expressed penitence for all his past actions.

那盗贼对他犯过的一切罪恶表示忏悔。

《新英汉大辞典》

Penitence is something that enervates our spirit.

后悔是一种耗费精神的情绪。

Penitence with not penitence perhaps later would understand of.

后悔与不后悔也许以后会明白的。