Just as we can get tired of doing good deeds, we can get tired of the struggle to do right.
Does that happen to you? Do you ever say, "I'll never get it right; why do I keep trying?"
Do you ever think you'll never be free of that temptation? Do you ever think everyone's given up on you but Satan?
I do, and I doubt I'm the only one. But when I feel that way, when my emotions betray me, my brain knows it's not true.
This is what's true: "He who began a good work in you will carry it on to completion until the day of Christ Jesus" (Phil 1.6).
So "let us throw off everything that hinders and the sin that so easily entangles, and let us run with perseverance the race marked out for us" (Heb 12.1) "for it is God who works in you to will and to act according to his good purpose" (Phil 2.13).
And when we fail, "if we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness" (1John 1.9).
"Who is he that condemns? Christ Jesus, who died—more than that, who was raised to life—is at the right hand of God and is also interceding for us" (Rom 8.34).
"For we do not have a high priest who is unable to sympathize with our weaknesses, but we have one who has been tempted in every way, just as we are—yet was without sin" (Heb 4.15).
Now "let us fix our eyes on Jesus, the author and perfecter of our faith, who for the joy set before him endured the cross, scorning its shame, and sat down at the right hand of the throne of God. Consider him who endured such opposition from sinful men, so that you will not grow weary and lose heart" (Heb 12.2-3).