1 Corinthians 15:1
Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand; Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;
These words were spoken near the end of Paul's work, when it was being rounded off, to a church with strange characteristics that needed sharp treatment. The gospel in the verse must be proclaimed and personally received, not with mere general assent but with intelligent reception of the truth in the heart, and the receiver must stand in what was received. The gospel declared here includes the resurrection as a central doctrine that was repeatedly stressed.
Religion in this standing cannot be changing but requires steadfast continuance. The receiver must keep in memory what was preached, hold firmly to the life-giving word, practice the truth in every respect, and perseveringly share the knowledge received with others. By such steadfast standing and remembering the receiver is saved; without it belief is in vain, staking time and eternity and the welfare of the soul on a deception, which is a terrible calamity.
This resurrection truth strengthens believers toward diligence, obedience, and cheerfulness. At this late point in the world's history it is altogether too late to believe in vain or to do anything in vain.