2 Corinthians 4:8-9
We are afflicted in every way, but are not crushed; [we are] perplexed, but not to the point of despair;
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.
Hebrews 12:1-4
Therefore, since we are surrounded by such a large crowd of spectators [Note: Christians are pictured here as being in a crowded arena, performing in the games], we should lay aside every [excessive] weight and sin that so easily entangle us, and with perseverance, we should run the race [of life] that lies before us.