Threats alone, are the weapons of the threatened man.

The supreme misfortune is when theory outstrips performance

The five senses are the ministers of the soul.

Feathers shall raise men even as they do birds towards heaven :- That is by letters written with their quills.

I am not to blame for putting forward, in the course of my work on science, any general rule derived from a previous conclusion.

If you put on more garments, the cold cannot reach you. Similarly, increase your patience and concentration and even great injuries cannot vex your mind.

Nature is full of infinite causes that have never occurred in experience.