From The School of Christian Perfection by Saint Alphonsus LIgouri...
Our holy faith is a treasure of unspeakable value, for in it we
possess first of all a divine light which serves to guide us safely
on the way to Heaven. That which we perceive with our senses or
comprehend with our reason may and often does lead us astray. The
truths of faith, on the contrary, are revealed by God, who can
neither deceive nor be deceived. In the second place, faith furnishes
us with an excellent means of showing our reverence and respect for
Faith is, moreover, a shield of protection against the enemies of our
salvation. St. John says: “This is the victory which overcometh the
world, our faith.” (1 John 5:4). God has created us simply to labor
at our souls’ salvation and to become holy. “This is the will of
God, your sanctification,” says the Apostle. (1 Thess. 4:3).....