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

The painter will produce pictures of little merit if he takes the works of others as his standard.

While you are alone you are entirely your own master and if you have one companion you are but half your own, and the less so in proportion to the indiscretion of his behavior.

You don't get into trouble because of the things you don't know. It is the things you don't know you don't know that really get you into a mess.

...The world wouldn't be the world, without trouble.

Inequality is the cause of all local movements.

You should prefer a good scientist without literary abilities than a literate one without scientific skills