Ancient laws remain in force long after the people have the power to change them.

It is the activity of the intellect that constitutes complete human happiness - provided it be granted a complete span of life, for nothing that belongs to happiness can be incomplete.

Those who have been eminent in philosophy, politics, poetry, and the arts have all had tendencies toward melancholia.

But the whole vital process of the earth takes place so gradually and in periods of time which are so immense compared with the length of our life, that these changes are not observed, and before their course can be recorded from beginning to end whole nations perish and are destroyed.

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A proper wife should be as obedient as a slave... The female is a female by virtue of a certain lack of qualities - a natural defectiveness.

The knowledge of the soul admittedly contributes greatly to the advance of truth in general, and, above all, to our understanding of Nature, for the soul is in some sense the principle of animal life.