The supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a simple datum of experience.

About Newton: Nature to him was an open book, whose letters he could read without effort.

A life directed chiefly toward the fulfillment of personal desires will sooner or later always lead to bitter disappointment.

One picture is worth a thousand words

Subtle is the Lord. Malicious, He is not.

The great need to grasp principles had caused me to spend most of my time on fruitless persuits.

We know nothing at all. All our knowledge is but the knowledge of schoolchildren. The real nature of things we shall never know.