2 Corinthians 4:1
Therefore, since it is by God's mercy that we are engaged in this ministry, we do not lose heart.
2 Corinthians 4:16
Therefore, as I said, we do not lose heart. No, even though outwardly we are wasting away, yet inwardly we are being renewed day by day.
Galatians 6:9
Let us never tire of doing right, for at the proper season we shall reap our harvest, if we do not grow weary.
2 Thessalonians 3:13
You, Brothers, must not grow weary of doing what is right.
Hebrews 12:3-5
Weigh well the example of him who had to endure such opposition from 'men who were sinning against themselves,' so that you should not grow weary or faint-hearted.