All food must be capable of being digested, and that what produces digestion is warmth; that is why everything that has soul in it possesses warmth.

The line between lawful and unlawful abortion will be marked by the fact of having sensation and being alive.

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.

There is more both of beauty and of raison d'etre in the works of nature- than in those of art.

Gentleness is the ability to bear reproaches and slights with moderation, and not to embark on revenge quickly, and not to be easily provoked to anger, but be free from bitterness and contentiousness, having tranquility and stability in the spirit.

To learn is a natural pleasure, not confined to philosophers, but common to all men.

If you would understand anything, observe its beginning and its development