Jesus protects for eternity those who belong to Him.
18 We know that no one who is born of God sins; but He who was born of God keeps him, and the evil one does not touch him.
19 We know that we are of God, and that the whole world lies in the power of the evil one.
20 And we know that the Son of God has come, and has given us understanding so that we may know Him who is true; and we are in Him who is true, in His Son Jesus Christ. This is the true God and eternal life.
New American Standard Bible: 1995 Update (La Habra, CA: The Lockman Foundation, 1995), 1 Jn 5:18–20.