It tells us, moreover, much about God and heavenly things, of which we should otherwise be in ignorance. As we look up into the sky in daytime we see a canopy of blue. It is only with the coming of night that we may perceive the countless stars that fill the firmament. If it were perpetual day we should never know of the myriads of heavenly bodies which stud the sky, and which only the darkness of night reveals. Likewise faith reveals to us ever so many consoling and valuable truths which we should never be able certainly to know otherwise.
Faith is concerned with spiritual or heavenly things.
It does not deal with agriculture or commerce or geography or with any earthly matters, except incidentally when it employs these things by way of parable or illustration in order to explain supernatural truths. The late Cecil Chesterton said, in a public lecture, that concerning what was vital to man there was more knowledge in the first page of the penny catechism than in all the books of philosophy ever published. And he had read more widely than most men. As a young man he had renounced Protestantism, the religion in which he was brought up, because of its inconsistencies. As Protestantism was the only Christianity he was acquainted with he thought that in rejecting it he was rejecting Christianity.