I love those who can smile in trouble.

The greatest geniuses sometimes accomplish more when they work less.

The five senses are the ministers of the soul.

If you are alone you belong entirely to yourself. If you are accompanied by even one companion you belong only half to yourself or even less in proportion to the thoughtlessness of his conduct and if you have more than one companion you will fall more deeply into the same plight.

Nothing is hidden under the sun.

The first of all simple colours is White ... We shall set down White for the representative of light, without which no colour can be seen; Yellow for the earth; Green for water; Blue for air; Red for fire; and Black for total darkness.

There is no result in nature without a cause; understand the cause and you will have no need of the experiment.