Romans 4:20-21 [NASB], "yet, with respect to the promise of God, he did not waver in unbelief but grew strong in faith, giving glory to God, 21 and being fully assured [persuaded] that what God had promised, He was able also to perform."

"An anchor is only as secure as that to which it is fastened to."   

Hebrews 6:19-20 [NASB], "This hope we have as an anchor of the soul, a hope both sure and steadfast and one which enters within the veil, 20 where Jesus has entered as a forerunner for us..."