Faith is a virtue infused by God into our souls, by which we believe ¹, without doubting, all those things which God has revealed, and proposes by His Church to our belief.

Because it is a gift of God, and an effect of His grace, which enlightens our understanding and moves our will to believe, without doubting, all those things which God has revealed. ²

Because a good will also belongs to faith; for no one can believe but he who is willing to believe. Therefore faith is also rewarded by God, and unbelief punished. ³

Because God is the eternal and infallible truth.

Faith is absolutely necessary to salvation; for 'without faith it is impossible to please God' ⁴. ^{5 6}

No; only the true faith, which Christ our Lord has taught, will save us. ⁷

Because by this faith alone, and by no other, we are made partakers of Christ, and without Christ there is no salvation. ⁸

Yes, it is a grievous sin to say so, or even only to think so ; for we despise God by it, who has given us the one true faith, and, therefore, has sent his Only Begotten Son into the world. ⁹

Yes; but he who fears God does also believe all that He has revealed, as Cornelius did ¹⁰. He, on the contrary, who does not believe all that God has revealed does not fear Him either, but rejects His Word, and denies His veracity.