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Common Sense is that which judges the things given to it by other senses.

Experience does not err. Only your judgments err by expecting from her what is not in her power.

For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.

He who is fixed to a star does not change his mind.

He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast.

He who wishes to be rich in a day will be hanged in a year.

Human subtlety will never devise an invention more beautiful, more simple or more direct than does nature because in her inventions nothing is lacking, and nothing is superfluous.

I have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do.

I have offended God and mankind because my work didn't reach the quality it should have.

I have wasted my hours.