Leonardo da Vinci on thinking

Simplicity is the ultimate sophistication.

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

Once you have flown, you will walk the earth with your eyes turned skywards, for there you have been, and there you long to return.

Great minds discuss ideas. Average minds discuss events. Small minds discuss people.

Eleanor Roosevelt1884–1962

• Ideas

It is the mark of an educated mind to be able to entertain a thought without accepting it.

Aristotle384–322 BC

• Education
• Ideas

He who learns but does not think, is lost! He who thinks but does not learn is in great danger.

Confucius551–479 BC

• Education