Obstinacy

Keeping the Torah takes obstinacy. If you do something good, repeat it. If you learn something, go over it again. Whatever you start, do it again to get used to it. Whatever you do that is holy, do it again and again, repeat it a thousand times. Repeat it even from sheer obstinacy. Pay no attention whatever to the subtle persuasion and insistent demoralization of the Evil One and your other opponents.

(Reb Nosson of Breslov)