Courage is the first of human qualities because it is the quality which guarantees the others.

Education is the best provision for old age

that prudence is not science is manifest: prudence concerns the ultimate particular thing, as was said, for the action performed is of this kind. Indeed, prudence corresponds to intellect, for intellect is concerned with the defining boundaries,43 of which there is no rational account; and prudence is concerned with the ultimate particular thing, of which there is not a science but rather a perception, and a perception not of things peculiar to one of the senses, but a perception of the sort by which we perceive that the ultimate particular thing, in mathematics, is a triangle.

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Co svou přítomností nebo nepřítomností nepůsobí pražádný patrný rozdíl, není důležitou částí celku.

The physician and the philosopher have different ways of defining the diseases of the soul. For instance anger for the philosopher is a sentiment born of the desire to return an offense, whereas for the physician it is a surging of blood around the heart.

"Quid quid movetur ab alio movetur"(nothing moves without having been moved).

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علامة العقل المتعلم هو قدرته على تداول الفكرة دون أن يتقبلها

The greatest virtues are those which are most useful to other persons.