'Full Assurance' in the Bible

that their hearts may be encouraged, they being knit together in love, and that they may attain to all the riches of a full assurance of the understanding, to the full knowledge of the mystery of God;

But we earnestly desire that every one of you may show the same diligence with regard to the full assurance of your hope even to the end;

let us draw near with a true heart in full assurance of faith, having had our hearts sprinkled from an evil conscience; and having had our bodies washed with pure water,