From the various Systematic Theology texts which I own, Hodge was the only one to spend considerable time about the ground of faith, therefore, another quote is in order to glean and learn from his wisdom:
When, therefore, a Christian is asked, Why he believes the Scriptures and the doctrines therein contained, his simple answer is, On the testimony or authority of God. How else could he know that the worlds were created by God, that our race apostatized from God, that He sent his Son for our redemption, that faith in Him will secure salvation. Faith in such truths can have no other foundation than the testimony of God. If asked, How God testifies to the truth of the Bible? If an educated man whose attention has been called to the subject, he will answer, In every conceivable way: by signs, wonders, and miracles; by the exhibition which the Bible makes of divine knowledge, excellence, authority, and power. If an uneducated man, he may simply say, “Whereas I was blind, now I see.” Such a man, and indeed every true Christian, passes from a state of unbelief to one of saving faith, not by any process of research or argument, but of inward experience. The change may, and often does, take place in a moment. The faith of a Christian in the Bible is, as before remarked, analogous to that which all men have in the moral law, which they recognize not only as truth, but as having the authority of God. What the natural man perceives with regard to the moral law the renewed man is enabled to perceive in regard to “the things of the Spirit,” by the testimony of that Spirit with and by the truth to his heart.
The Blessings of Faith
Scripture is filled with statements as to the fruits of faith. The Confession explicitly mentions a few: “justification, sanctification, and eternal life, by virtue of the covenant of grace.” The following blessings of the covenant are said to come by or through faith:
Justification: Justification is by faith through grace (e.g. Eph. 2:8-9; Rom. 3:22, 28; 5:1; Gal. 2:16). Faith is not the reason for justification. Neither is it the ground. The only reason and ground of justification is the active and passive obedience of Christ. Faith merely receives Christ Who has done everything for our justification. See chapter 11.
Sanctification: We are not justified by faith and then left to be sanctified by works. Christians are described as “those who are sanctified by faith in me” (Acts 26:18). Galatians 5:6 says that faith works through love, which is a growing fruit of holiness. See chapter 13.
Eternal life: The most popular verse of the Bible declares: “For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life” (John 3:16, 36; 6:40, 54, 68; 10:27-28). This eternal life is not only endless lif...