One has no right to love or hate anything if one has not acquired a thorough knowledge of its nature. Great love springs from great knowledge of the beloved object, and if you know it but little you will be able to love it only a little or not at all.

When taking a selfie, remember the most natural pose is still best

The light and heat of the universe comes from the sun, and its cold and darkness from the withdrawal of the sun.

All our knowledge hast its origins in our perceptions … In nature there is no effect without a cause … Experience never errs; it is only your judgments that err by promising themselves effects such as are not caused by your experiments … Science is the observation of things possible, whether present or past; prescience is the knowledge of things which may come to pass.

My body is not a tomb for animals.

Art is the queen of all sciences communicating knowledge to all the generations of the world.

A bird is an instrument working according to mathematical law, which instrument it is within the capacity of man to reproduce with all its movements.