Figuring out how to think about the problem.

When a man points a finger at someone else, he should remember that three of his fingers are pointing at himself. Do not worry about your difficulties in mathematics; I can assure you that mine are still greater.

Thinking is hard work; that's why so few do it.

One picture is worth a thousand words

The most beautiful thing we can experience is the mysterious. It is the source of all true art and science.

This is a question too difficult for a mathematician. It should be asked of a philosopher"(when asked about completing his income tax form)

Men like Henry George [ the pioneer of land value taxation] are rare, unfortunately. One cannot imagine a more beautiful combination of intellectual keenness, artistic form, and fervent love of justice.