Sit in reverie 

and watch the changing colour of the waves 

that break upon the idle seashore 

of the mind.

Truth is the torch that gleams through the fog without dispelling it.

To remember where you come from 

is part of where you're going.

The centre that I cannot find is known to my unconscious mind.

To know that we know what we know, 

and to know that we do not know what we do not know, 

that is true knowledge.

Indeed, every true science has for its object 

the determination of certain phenomena by means of others, 

in accordance with the relations which exist between them.

Fundamental progress has to do with the reinterpretation of basic ideas.

A moral being 

is one who is capable 

of reflecting on his past actions 

and their motives — 

of approving of some 

and disapproving of others.

If one knows only what one is told, 

one does not know enough 

to be able to arrive at a well-balanced decision.

Chance alone is at the source of all novelty, all creation in the biosphere.

An absolutely new idea is one of the rarest things known to man.

You only find what you are looking for, 

really, 

if the truth be known.

Observation and thinking are the two points of departure 

for all the spiritual striving of man, 

insofar as he is conscious of such striving. 

The workings of common sense, 

as well as the most complicated scientific researches, 

rest on these two fundamental pillars of our spirit.

Mistakes are the portals of discovery.