Revelation 3:5,6

He that overcometh That is finally victorious over his spiritual enemies; shall be clothed in white raiment In the habit of victory, joy, and triumph; and I will not blot his name out of the book of life Like that of the angel of the church at Sardis. See on Philippians 4:3; Daniel 12:1. This passage plainly implies, that some names shall be blotted out from the book of life: that is, some who, in consequence of their adoption and regeneration, were entitled to and fitted for eternal life, shall, through falling from grace, lose these blessings, and come again under guilt, condemnation, and wrath. But I will confess his name Who overcomes to the end, as one of my faithful servants and soldiers; before my Father In the great day of decisive judgment: and as he was enrolled among my believing, loving, and obedient people, he shall continue for ever in their number. He that hath an ear, &c. Let everyone that hears this be animated by so glorious a hope to exert his utmost efforts in this holy and honourable warfare.