What is Faith?
Faith is a Divine virtue by which we firmly believe the truths which God has revealed.
Is Faith necessary for salvation?Faith is necessary for salvation, for our Lord says, "He that believeth not shall be condemned." Matt. 16: 16.
"Without faith, it is impossible to please God." Heb. 11: 6.
Is Faith alone sufficient for salvation?Faith alone is not sufficient for salvation, for without good works it is dead and useless, as the body without the soul, is dead and worthless. James 2: 26.
Advanced Catechism of Catholic Faith, 1922 (Page 47).