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Life is like riding a bicycle. To keep your balance you must keep moving.

Logic will get you from A to B. Imagination will take you everywhere.

Look deep into nature, and then you will understand everything better.

Love is a better teacher than duty.

Make a lot of walks to get healthy and don’t read that much but save yourself some until you’re grown up.

Make everything as simple as possible, but not simpler.

Memory is deceptive because it is colored by today's events.

My religion consists of a humble admiration of the illimitable superior spirit who reveals himself in the slight details we are able to perceive with our frail and feeble mind.

Morality is of the highest importance - but for us, not for God.

Most of the fundamental ideas of science are essentially simple, and may, as a rule, be expressed in a language comprehensible to everyone.