I. An exhortation, and this threefold:—1. That they should be stedfast—hedraioi, firm, fixed in the faith of the gospel, that gospel which he had preached and they had received, namely, That Christ died for our sins, and arose again the third day, according to the scriptures ( v. 3, 4), and fixed in the faith of the glorious resurrection of the dead, which, as he had shown, had so near and necessary a connection with the former. "Do not let your belief of these truths be shaken or staggered. They are most certain, and of the last importance." Note, Christians should be stedfast believers of this great article of the resurrection of the dead. It is evidently founded on the death of Christ. Because he lives, his servants shall live also, John 14 19. And it is of the last importance; a disbelief of a future life will open a way to all manner of licentiousness, and corrupt men's morals to the last degree. It will be easy and natural to infer hence that we may live like beasts, and eat and drink, for to-morrow we die. 2. He exhorts them to be immovable, namely, in their expectation of this great privilege of being raised incorruptible and immortal. Christians should not be moved away from this hope of this gospel (Col 1 23), this glorious and blessed hope; they should not renounce nor resign their comfortable expectations. They are not vain, but solid hopes, built upon sure foundations, the purchase and power of their risen Saviour, and the promise of God, to whom it is impossible to lie—hopes that shall be their most powerful supports under all the pressures of life, the most effectual antidotes against the fears of death, and the most quickening motives to diligence and perseverance in Christian duty. Should they part with these hopes? Should they suffer them to be shaken? Note, Christians should live in the most firm expectation of a blessed resurrection. This hope should be an anchor to their souls, firm and sure, Heb 6 19. 3. He exhorts them to abound in the work of the Lord, and that always, in the Lord's service, in obeying the Lord's commands. They should be diligent and persevering herein, and going on towards perfection; they should be continually making advances in true piety, and ready and apt for every good work. The most cheerful duty, the greatest diligence, the most constant perseverance, become those who have such glorious hopes. Can we too much abound in zeal and diligence in the Lord's work, when we are assured of such abundant recompences in a future life? What vigour and resolution, what constancy and patience, should those hopes inspire! Note, Christians should not stint themselves as to their growth in holiness, but be always improving in sound religion, and abounding in the work of the Lord.

Matthew Henry Commentary on the Whole Bible (Concise) (Matthew Henry)

Verses 1-11 The word resurrection, usually points out our existence beyond the grave. Of the apostle's doctrine not a trace can be found in all the teaching of philosophers. The doctrine of Christ's death and resurrection, is the foundation of Christianity. Remove this, and all our hopes for eternity sink at once. And it is by holding this truth firm, that Christians stand in the day of trial, and are kept faithful to God. We believe in vain, unless we keep in the faith of the gospel. This truth is confirmed by Old Testament prophecies; and many saw Christ after he was risen. This apostle was highly favoured, but he always had a low opinion of himself, and expressed it. When sinners are, by Divine grace, turned into saints, God causes the remembrance of former sins to make them humble, diligent, and faithful. He ascribes to Divine grace all that was valuable in him. True believers, though not ignorant of what the Lord has done for, in, and by them, yet when they look at their whole conduct and their obligations, they are led to feel that none are so worthless as they are. All true Christians believe that Jesus Christ, and him crucified, and then risen from the dead, is the sun and substance of Christianity. All the apostles agreed in this testimony; by this faith they lived, and in this faith they died.