It is not academic belief in an abstract truth, nor an acceptance of some fact of history which does not personally affect us, but the firm conviction that what Christ, or His accredited Church, teaches, is a living truth which has a bearing on the conduct of life. It is thus that faith not only tells us that in God there are three Persons, but that the Second Person became man for our salvation. It shows us the infinite love of God the Father who gave His Son for us, and also the immeasurable love of God the Son, who died for us, and that of the Holy Ghost who sanctities us by grace and enables us to attain a share in the blessed life of the Trinity. Faith manifests Christ to us as the Way, the Truth, and the Life. It will thus be seen that faith gives us that incentive to virtue which is so necessary in a sinful world, and that certainty about life which is so comforting in a doubting world.
Catholics never doubt about the truths of revelation.
They are as certain with regard to them as they are of their own existence. Difficulties they may have. But as Cardinal Newman has said, ten thousand difficulties do not make a doubt. We have difficulties about the nature of electricity and radio and other natural phenomena, but we have no doubts as to the reality of those things. If a soldier has faith in a general only when the general demonstrates the wisdom of his orders it is hardly faith at all.