A mathematician is a blind man in a dark room looking for a black cat that isn't there.

The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.

How paramount the future is to the present when one is surrounded by children.

Intelligence is based on how efficient a species became at doing the things they need to survive.

Only the fittest will survive.

It is impossible to conceive of this immense and wonderful universe as the result of blind chance or necessity.

I am not apt to follow blindly the lead of other men

Some call it evolution, And others call it God.

It is always advisable to perceive our ignorance.

Man, wonderful man, must collapse, into nature's cauldron, he is no deity, he is no exception.

Ignorance more frequently begets confidence than does knowledge.

The more one thinks the more one feels the hopeless immensity of man's ignorance.

A man who dares to waste one hour has not discovered the value of life.

Building a better mousetrap merely results in smarter mice.

The most important factor in survival is neither intelligence nor strength but adaptability.

The world will not be inherited by the strongest, it will be inherited by those ablest to change.

The love for all living creatures is the noblest attribute of man.

What we know of other people's only our memory of the moments during which we knew them.

Between the conception and the creation, between the emotion and the response, Falls the shadow.