Leonardo da Vinci on fear

Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind.

Simplicity is the ultimate sophistication.

Anyone who invokes authors in discussion is not using his intelligence but his memory.

Fear is your best friend or your worst enemy. It’s like fire. If you can control it, it can cook for you; it can heat your house. If you can’t control it, it will burn everything around you and destroy you. If you can control your fear, it makes you more alert, like a deer coming across the lawn.

Mike Tysonborn 1966

As a rule, men worry more about what they can’t see than about what they can.

Julius Caesar100–44 BC

The only thing we have to fear is fear itself⁠—nameless, unreasoning, unjustified terror which paralyzes needed efforts to convert retreat into advance.

Franklin D. Roosevelt1882–1945Franklin D. Roosevelt’s First Inaugural Address (1933)