2 Corinthians 4:1
So, having obtained this ministry through [God's] mercy, we do not become discouraged.
2 Corinthians 4:16
Therefore, we do not get discouraged, for though our physical body is decaying, yet our inner person is being renewed daily.
Galatians 6:9
And we should not become tired of doing good things, for eventually we will receive [never ending life] if we do not give up.
2 Thessalonians 3:13
But you, brothers, should not get tired of doing what is right.
Hebrews 12:3-5
Now think about how Jesus endured such opposition against Himself from sinners, so that you do not grow weary and become discouraged [yourself].