24. Resolved, whenever I do any conspicuously evil action, to trace it back, till I come to the original cause; and then both carefully endeavor to do so no more, and to fight and pray with all my might against the original of it.
25. Resolved, to examine carefully, and constantly, what that one thing in me is, which causes me in the least to doubt of the love of God; and to direct all my forces against it.
It would be profitable for us to fight our sins. But fighting them at a wrong level will get us nowhere. Worse still, it can even deceive us to build up our pride while outwardly actions can be morally acceptable in everyone's view.
(Source: A Puritan's Mind)