assurance
noun
°The act of assuring; a declaration tending to inspire full confidence; that which is designed to give confidence.
"Whereof he hath given assurance unto all men, in that he hath raised him from the dead. Acts xvii. 31."
°The state of being assured; firm persuasion; full confidence or trust; freedom from doubt; certainty.
"Let us draw with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience. Heb. x. 22."