There are many occasions when the muscles that form the lips of the mouth move the lateral muscles that are joined to them, and there are an equal number of occasions when these lateral muscles move the lips of this mouth, replacing it where it cannot return of itself, because the function of muscle is to pull and not to push except in the case of the genitals and the tongue.

Those who are enamoured of practice without science are like a pilot who goes into a ship without rudder or compass and never has any certainty of where he is going. Practice should always be based upon a sound knowledge of theory.

Anyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.

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.

I woke up only to find the rest of the world asleep.

It is the infinite alone that cannot be attained, for if it could it would become finite.

The truth of things is the chief nutriment of superior intellects.