Faith is a very common commodity exercised daily in everyday affairs.
A check is accepted, for example, because the issuer of the check says he has money in the bank and the one who accepts the check trusts in his veracity. Faith appropriates all of the promises of God and proceeds on the basis of those promises. Faith gives substance to things that are not yet seen. By faith there is an apprehension of the invisible that gives assurance of its reality. The heroes of faith took the promises relating to a future state if affairs and acted as if they were present.