John 10:28 I give them eternal life, and they shall never perish; no one will snatch them out of my hand.
It is through God’s mercy and grace that we get eternal life. It is not anything we can do but the free gift from Jesus Christ our Saviour!
The eternal life that He gives to us is not going to stop. Once it has been given it is ours to keep, just as a non-perishable gift is.
It is not like a money bag when there are pick-pockets around. This gift is given to us and nobody is going to take it away from us. It is ours to keep.