Take another instance, arising from the fact of parentage and offspring, in the sentient beings of the world. A pair, no matter to what class they belong, by the fact of becoming parents, establish a new relation for themselves; and, "after their kind," they are under bonds to their young. And, to a greater or less extent, their young have a claim upon them. As we ascend in the scale of being, the duty imposed is greater, and the claim of the offspring stronger. Whether it be the fierce eagle, or the timid dove, or the chirping sparrow; whether it be the prowling lion, or the distrustful deer, or the cowering hare; or whether it be the races of man who are examined, the relations established by parentage are everywhere recognized. Now, will one say that all this might be changed for aught we know; that, what we call law, is only a judgment of mankind; and so that this relation did not exist at first, but was the product of growth? And will one further say that there is no necessity or universality in this relation; but that the races might, for aught we know, have just as well been established with a parentage which involved no relation at all; that the fabled indifference of the ostrich, intensified a hundredfold, might have been the law of sentient being? Yet such results logically flow from the principles of the Limitists. Precisely the same line of argument might be pursued respecting the laws of human society. But it is not needed here. It is evident now, that what gives validity to judgments _is the fact that they accord with an a priori principle in the mind_. Third. The ideas and beliefs which pertain to beauty. A science of beauty has not yet been sufficiently developed to permit of so extensive an illustration of this class as the others. Yet enough is established for our purpose. Let us consider beauty as in proportioned form. It is said that certain Greek mathematicians, subsequently to the Christian era, studied out a mathematical formula for the human body, and constructed a statue according to it; and that both were pronounced at the time _perfect_. Both statue and formula are now lost. Be the story true, or a legend, there is valid ground for the assertion, that the mind instinctively assumes, in all its criticisms, the axiom, There is a perfect ideal by which as standard, all art must be judged. The very fact that the mind, though acknowledging the imperfection of its own ideal, unconsciously asserts, that somewhere, in some mind, there is an ideal, in which a perfect hand joins a perfect arm, and a perfect foot a perfect leg, and these a perfect trunk; and a perfect neck supports a perfect head, adorned by perfect features, and thus there is a perfect ideal, is _decisive_ that such an ideal exists. And this conclusion is true, because God who made us, and constructed the ground from whence this instinctive affirmation springs, is true.