2 Corinthians 4:8-9
On every side I am ever hard-pressed, but never hemmed in; always perplexed, but never to the point of despair;
2 Corinthians 4:16
So I never give up; instead, although my outer nature is wasting away, my inner nature is constantly renewed from day to day.
Galatians 6:9
Let us stop getting tired of doing good, for at the proper time we shall reap if we do not give up.
Hebrews 12:1-4
Therefore, as we have so vast a crowd of spectators in the grandstands, let us throw off every impediment and the sin that easily entangles our feet, and run with endurance the race for which we are entered,