A homily of St. Augustine, taken from the Tridentine Breviary:
The miracles which our Lord Jesus Christ did were the very works of God, and they enlighten the mind of man by mean of things which are seen, that he may know more of God. God is Himself of such a Substance as eye cannot see, and the miracles, by the which He ruleth the whole world continually, and satisfieth the need of everything that He hath made, are by use become so common, that scarce any will vouchsafe to see that there are wonderful and amazing works of God in every grain of seed of grass. According to His mercy He kept some works to be done in their due season, but out of the common course and order of nature, that men might see them and be astonished, not because they are greater, but because they are rarer than those which they lightly esteem, since they see them day by day. Or it is a greater miracle to govern the whole universe, than to satisfy five thousand men with five loaves of bread; and yet no man marvelleth at it. At the feeding of the five thousand, men marvel, not because it is a greater miracle than the other, but because it is rarer. For Who is He Who now feedeth the whole world, but He Who, from a little grain that is sown, maketh the fulness of the harvest? God worketh in both cases in one and the same manner. He Who of the sowing maketh to come the harvest, is He Who of the five barley loaves in His Hands made bread to feed five thousand men; for Christ's are the Hands which are able to do both the one and the other. He Who multiplieth the grains of corn multiplied the loaves, only not by committing them to the earth whereof He is the Maker. This miracle, then, is brought to bear upon our bodies, that our souls may thereby be quickened; shown to our eyes, to give food to our understanding; that, through His works which we see, we may marvel at that God Whom we cannot see, and, being roused up to believe, and purified by believing, we may long to see Him, yea, may know by things which are seen Him Who is Unseen. Nor yet sufficeth it for us to see only this meaning in Christ's miracles. Let us ask of the miracles themselves what they have to tell us concerning Christ for, soothly, they have a tongue of their own, if only we will understand it. For, because Christ is the Word of God, therefore the work of the Word is a Word for us.