Westminster Confession Of Faith – Lord’s Day 28
Chapter 18 – Of the Assurance of Grace and Salvation (Paragraphs 1-2)
I. Although hypocrites, and other unregenerate men, may vainly deceive themselves with false hopes and carnal presumptions: of being in the favour of God and estate of salvation; which hope of theirs shall perish: yet such as truly believe in the Lord Jesus, and love him in sincerity, endeavouring to walk in all good conscience before him, may in this life be certainly assured that they are in a state of grace, and may rejoice in the hope of the glory of God: which hope shall never make them ashamed.
II. This certainty is not a bare conjectural and probably persuasion, grounded upon a fallible hope; but an infallible assurance of faith, founded upon the divine truth of the promises of salvation, the inward evidence of those graces unto which these promises are made, the testimony of the Spirit of adoption witnessing with our spirits that we are the children of God; which Spirit is the earnest of our inheritance, whereby we are sealed to the day of redemption.