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.
Hebrews 12:3
Now think about how Jesus endured such opposition against Himself from sinners, so that you do not grow weary and become discouraged [yourself].
Hebrews 12:5
And have you forgotten the exhortation that was addressed to you as sons? [Prov. 3:11f says], "My son, do not take the discipline of the Lord lightly, and do not get discouraged when He rebukes you.