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In nature there are neither rewards nor punishment - there are consequences.

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The man without a purpose is like a ship without a rudder - waif, a nothing, a no man. Have a purpose in life, and, having it, throw such strength of mind and muscle into your work as God has given you.

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Everywhere is walking distance if you have the time.

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We ought not to look back unless it is to derive useful lessons from past errors, and for the purpose of profiting by dear-brought experience.

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Quality is never an accident; it is always the result of high intention, sincere effort, intelligent direction and skillful execution; it represents the wise choice of many alternatives.

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Two things, well considered, would prevent many quarrels; first to have it well ascertained whether we are not disputing about terms rather than things; and secondly, to examine whether that on which we differ in worth contending about.

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In false quarrels there is no true valor.

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A sudden bold and unexpected question doth many times surprise a man and lay him open.

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The important thing is not to stop questioning. Curiosity has its own reason for existing. One cannot help but be in awe when he contemplates the mysteries of eternity, of life, of the marvelous structure of reality. It is enough if one tries merely to comprehend a little of this mystery every day. Never lose a holy curiosity.

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The scientist is not a person who gives the right answers, he is one who asks the right questions.

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