WCF 14.2.
By this faith, a Christian believeth to be true whatsoever is revealed in the Word, for the authority of God Himself speaking therein; (John 4:42, 1 Thess. 2:13, 1 John 5:10, Acts 24:14) and acteth differently upon that which each particular passage thereof containeth; yielding obedience to the commands, (Rom. 16:26) trembling at the threatenings, (Isa. 66:2) and embracing the promises of God for this life, and that which is to come. (Heb. 11:13, 1 Tim. 4:8) But the principal acts of saving faith are accepting, receiving, and resting upon Christ alone for justification, sanctification, and eternal life, by virtue of the covenant of grace. (John 1:12, Acts 16:31, Gal. 2:20, Acts 15:11)