For since we believe that Jesus died and rose again, even so, through Jesus, God will bring with him those who have fallen asleep.
14 For if we believe. He assumes this axiom of our faith, that Christ was raised up from the dead, that we might be partakers of the same resurrection: from this he infers, that we shall live with him eternally.
In these words the apostle comforts the Thessalonians who mourned for the death of their relations and friends that died in the Lord. His design is to dissuade them from excessive grief, or inordinate sorrow, on that account. All grief for the death of friends is far from being unlawful; we may weep at least for ourselves if we do not weep for them, weep...
Commenting on 1 Thessalonians 4:13-18
For if we believe that Jesus died, and rose again,.... As every Christian does, for both the death and resurrection of Christ are fundamental articles of faith; nothing is more certain or more comfortable, and more firmly to be believed, than that Christ died for the sins of his people, and rose again for their justification; on these depend the present peace, joy, and comfort...