2 Peter 1:10 Wherefore the rather, brethren, give diligence to make your calling and election sure: for if you do these things, ye shall never fall.
A historic theological argument rages over the doctrine of eternal security, or the perseverance of the saints. Can one lose his salvation? Can one fall from grace? Is it “once saved always saved,” or can a one-time believer later reject grace and salvation?
Paradoxically, both are true: on the one hand, God promises to keep us through life unto final salvation and He keeps His promise; but on the other hand, and at the same time, He does not force Himself and He permits us the free will to reject Him if we choose. God’s action is secure; human action is unsure. ”No one will snatch them out of my hand” but one can himself choose to jump out. A saved Christian retains the power to say No.
Though God promises you shall never fall, the very fact that He promises implies that it is possible. However, we are told to “make our calling and election sure.” We do so for our own peace and security, not because we doubt God’s grace and ability to keep. How do we do that? Simple: repent and believe the gospel. Examine yourself: am I sorry for my sins and believe Jesus died for me? We may do this weekly and daily, and so rest assured I will never fall. The peace of God will keep our hearts and minds in Christ Jesus.