Having thus gained the knowledge which is necessary to life, health, industry, and citizenship, the student is prepared to enter a wider and grander field of thought. If he desires that large and liberal culture, which will call into activity all his powers, and make the most of the material God has given him, he must study deeply and earnestly the intellectual, the moral, the religious, and the æsthetic nature of man; his relations to nature, to civilization, past and present, and above all, his relations to God. These should occupy nearly, if not fully, half the time of his college course. In connection with the philosophy of the mind, he should study logic, the pure mathematics, and the general laws of thought. In connection with moral philosophy, he should study political and social ethics--a science so little known either in colleges or congresses. Prominent among all the rest should be his study of the wonderful history of the human race, in its slow and toilsome march across the centuries--now buried in ignorance, superstition and crime; now rising to the sublimity of heroism and catching a glimpse of a better destiny; now turning remorselessly away from, and leaving to perish, empires and civilizations in which it had invested its faith, and courage, and boundless energy for a thousand years, and plunging into the forests of Germany, Gaul, and Britain, to build for itself new empires, better fitted for its new aspirations; and, at last, crossing three thousand miles of unknown sea, and building in the wilderness of a new hemisphere its latest and proudest monuments. [Speech in the House of Representatives, February 12, 1867.] I cannot forget that we have learned slowly.... I cannot forget that less than five years ago I received an order from my superior officer commanding me to search my camp for a fugitive slave, and if found, to deliver him up to a Kentucky captain who claimed him as his property; and _I had the honor to be perhaps the first officer in the army who peremptorily refused to obey such an order_. We were then trying to save the Union without hurting slavery.... It took us two years to reach a point where we were willing to do the most meagre justice to the black man, and to recognize the truth that "A man's a man for a' that!"