Surrounded by a great cloud of witnesses, believers must lay aside every weight and the sin that clings so closely, and run with endurance the race set before them, looking to Jesus, the founder and perfecter of faith, who for the joy set before him endured the cross, despising the shame, and sat down at the right hand of the throne of God. They must consider him so as not to grow weary; they have not yet resisted to the point of shedding blood.
Citing Proverbs 3:11-12, the author reminds them that God treats them as sons: the Lord disciplines the one he loves. God, the Father of spirits, does so for our good, that we may share his holiness. No discipline seems pleasant at the time, but later it yields the peaceful fruit of righteousness to those trained by it. So they must lift drooping hands and strengthen weak knees, strive for peace and holiness, without which no one will see the Lord, and see that no root of bitterness springs up. Esau, who sold his birthright for a single meal, is the warning: afterward, when he wanted to inherit the blessing, he was rejected and found no chance to repent, though he sought it with tears.
The author contrasts two mountains. They have not come to Mount Sinai, with its blazing fire, darkness, gloom, tempest, trumpet blast and a voice that made even Moses tremble, but to Mount Zion, the city of the living God, the heavenly Jerusalem, with innumerable angels, the assembly of the firstborn, God the judge of all, the spirits of the righteous made perfect, Jesus the mediator of a new covenant and the sprinkled blood that speaks a better word than Abel's.
So they must not refuse him who is speaking from heaven. God will shake once more not only the earth but also the heavens, and we receive a kingdom that cannot be shaken; let us be thankful and offer to God acceptable worship, with reverence and awe, for our God is a consuming fire.