Jesus endured. We must run with endurance. Jesus had joy set before him. We have a race set before us. That's why we look to him! Focus is the key to endurance.
Discipline, though not joyous, is proof of our legitimate sonship to God. He disciplines us out of love. Discipline prompts us to respect God and is designed to protect us from his judgment (Heb 12:29). We dare not despise his discipline.
So many small gems in this chapter. Jesus' blood speaks better things than Abel's (Heb 12:24). Esau did not find repentance even though he sought it with tears (Heb. 12:16-17). Our God is a consuming fire - end of discussion (Heb. 12:29).