Those 'on the rock' are people who on hearing the word welcome it with enthusiasm, but they have no root; they believe for a while and fall away in the hour of trial.
Because you have kept the word of my patient endurance, I will keep you safe through the hour of trial which is coming upon the whole world to test the dwellers on earth.
Epaphras, who is one of yourselves, salutes you — a servant of Christ Jesus who is always earnest in prayer for you, that you may stand firm like mature and convinced Christians, whatever be the will of God for you.