It is undesirable to believe a proposition 

when there is no ground whatever 

for supposing it true.

Biology is the study of the complex things in the Universe. 

Physics is the study of the simple ones.

To be is to be perceived

A fact is a simple statement 

that everyone believes. 

It is innocent, unless found guilty. 

An hypothesis is a novel suggestion 

that no one wants to believe. 

It is guilty, until found effective.

Science is the acceptance of what works 

and the rejection of what does not. 

That needs more courage than we might think.

If you are the master 

be sometimes blind, 

if you are the servant 

be sometimes deaf.

What we wish, 

we readily believe, 

and what we ourselves think, 

we imagine others think also.

It is a miracle that curiosity survives formal education.

It takes two to speak the truth: 

one to speak, 

and another to hear.

We have to live today 

by what truth we can get today 

and be ready tomorrow 

to call it falsehood.

The function of education 

is to teach one to think intensively 

and to think critically. 

Intelligence plus character — 

that is the goal of true education.

It is our less conscious thoughts 

and our less conscious actions 

which mainly mould our lives 

and the lives of those 

who spring from us.

We build too many walls 

and not enough bridges.

Every great advance in science 

has issued from a new audacity 

of imagination.

The worst sin toward our fellow creatures 

is not to hate them, 

but to be indifferent to them: 

that's the essence of inhumanity.