The theoretical use of reason was concerned with objects of the cognitive faculty only, and a critical examination of it with reference to this use applied properly only to the pure faculty of cognition; because this raised the suspicion, which was afterwards confirmed, that it might easily pass beyond its limits, and be lost among unattainable objects, or even contradictory notions.

Ethics in ancient times signified moral philosophy (philosophia moral is) generally, which was also called the doctrine of duties. Subsequently it was found advisable to confine this name to a part of moral philosophy, namely, to the doctrine of duties which are not subject to external laws (for which in German the name Tugendlehre was found suitable).

Unless suffering is the direct and immediate object of life, our existence must entirely fail of its aim. It is absurd to look upon the enormous amount of pain that abounds everywhere in the world, and originates in needs and necessities inseparable from life itself, as serving no purpose at all and the result of mere chance. Each separate misfortune, as it comes, seems, no doubt, to be something exceptional; but misfortune in general is the rule.

Between ourselves, my dear fellow, I don’t care about the way you sometimes have of exhibiting your talent for philosophy; you make religion a subject for sarcastic remarks, and even for open ridicule. Every one thinks his religion sacred, and therefore you ought to respect it.

Let no one be slow to seek wisdom when he is young nor weary in the search thereof when he is grown old. For no age is too early or too late for the health of the soul.

Death is nothing to us; for the body, when it has been resolved into its elements, has no feeling, and that which has no feeling is nothing to us.

Of all the faculties, you will find not one which is capable of contemplating itself; and, consequently, not capable either of approving or disapproving. How far does the grammatic art possess the contemplating power? As far as forming a judgement about what is written and spoken. And how far music?

The structure of the poem over the six books falls into two main parts. The first three books provide a fundamental account of being and nothingness, matter and space, the atoms and their movement, the infinity of the universe both as regards time and space, the regularity of reproduction, the nature of mind and spirit as material bodily entities, and their mortality, since they and their functions end with the bodies that contain them and with which they are interwoven. The last three books give an atomic and materialist explanation of phenomena preoccupying human reflection, such as vision and the senses, sex and reproduction, natural forces and agriculture, the heavens, and disease.

Seneca, the favourite classic of the early fathers of the church and of the Middle Ages, whom Jerome, Tertullian, and Augustine speak of as “Seneca noster,” who was believed to have corresponded with St. Paul, and upon whom Calvin wrote a commentary, seems almost forgotten in modern times. Yet Seneca’s morality is always pure, and from him we gain, albeit at second hand, an insight into the doctrines of the Greek philosophers, Zeno, Epicurus, Chrysippus, &c., whose precepts and system of religious thought had in cultivated Roman society taken the place of the old worship of Jupiter and Quirinus.

From my grandfather Verus I learned good morals and the government of my temper. From the reputation and remembrance of my father, modesty and a manly character. From my mother, piety and beneficence, and abstinence, not only from evil deeds, but even from evil thoughts; and further, simplicity in my way of living, far removed from the habits of the rich. From my great-grandfather, not to have frequented public schools, and to have had good teachers at home, and to know that on such things a man should spend liberally.

The earliest literature of India is the Vedas. These consist mostly of hymns in praise of nature gods, such as fire, wind, etc. Excepting in some of the hymns of the later parts of the work, there is not much philosophy in them in our sense of the term. It is here that we first find intensely interesting philosophical questions of a more or less cosmological character expressed in terms of poetry and imagination.