4 Virtues exist in us also by nature, and the soul has affinity with them not by education, but by nature herself. We do not need lessons to hate illness, but by ourselves we repel what afflicts us, the soul has no need of a master to teach us to avoid vice. Now all vice is a sickness of the soul as virtue is its health. Thus those have defined health well who have called it a regularity in the discharge of natural functions; a definition that can be applied without fear to the good condition of the soul. Thus, without having need of lessons, the soul can attain by herself to what is fit and conformable to nature. Hence it comes that temperance everywhere is praised, justice is in honour, courage admired, and prudence the object of all aims; virtues which concern the soul more than health concerns the body. Children love your parents, and you, “parents provoke not your children to wrath.” Does not nature say the same? Paul teaches us nothing new; he only tightens the links of nature. If the lioness loves her cubs, if the she wolf fights to defend her little ones, what shall man say who is unfaithful to the precept and violates nature herself; or the son who insults the old age of his father; or the father whose second marriage has made him forget his first children?
With animals invincible affection unites parents with children. It is the Creator, God Himself, who substitutes the strength of feeling for reason in them. From whence it comes that a lamb as it bounds from the fold, in the midst of a thousand sheep recognises the colour and the voice of its mother, runs to her, and seeks its own sources of milk. If its mother's udders are dry, it is content, and, without stopping, passes by more abundant ones. And how does the mother recognise it among the many lambs? All have the same voice, the same colour, the same smell, as far at least as regards our sense of smell. Yet there is in these animals a more subtle sense than our perception which makes them recognise their own. The little dog has as yet no teeth, nevertheless he defends himself with his mouth against any one who teases him. The calf has as yet no horns, nevertheless he already knows where his weapons will grow. Here we have evident proof that the instinct of animals is innate, and that in all beings there is nothing disorderly, nothing unforeseen. All bear the marks of the wisdom of the Creator, and show that they have come to life with the means of assuring their preservation.
The dog is not gifted with a share of reason; but with him instinct has the power of reason. The dog has learned by nature the secret of elaborate inferences, which sages of the world, after long years of study, have hardly been able to disentangle. When the dog is on the track of game, if he sees it divide in different directions, he examines these different paths, and speech alone fails him to announce his reasoning. The creature, he says, is gone here or there or in another direction. It is neither here nor there; it is therefore in the third direction. And thus, neglecting the false tracks, he discovers the true one. What more is done by those who, gravely occupied in demonstrating theories, trace lines upon the dust and reject two propositions to show that the third is the true one?
Does not the gratitude of the dog shame all who are ungrateful to their benefactors? Many are said to have fallen dead by their murdered masters in lonely places. Others, when a crime has just been committed, have led those who were searching for the murderers, and have caused the criminals to be brought to justice. What will those say who, not content with not loving the Master who has created them and nourished them, have for their friends men whose mouth attacks the Lord, sitting at the same table with them, and, while partaking of their food, blaspheme Him who has given it to them?
Source: Nine Homilies of Hexaemeron (New Advent)