"....for I know whom I have believed, and am persuaded that He is able to keep that which I have committed unto him against that day." (2 Tim 1:12)
"....Let every man be fully persuaded in his own mind." (Romans 14:5)
"For he that is entered into his rest, he also hath ceased from his own works, as God did from his." (Heb 4:10)
Other great verses.
Praise God that He keeps us because that gives me that security that I could NEVER have if it were up to me and my efforts.