Curiosity is one of the most permanent and certain characteristics of a vigorous intellect.

We cannot teach people anything; 

we can only help them discover it within themselves.

Stuff your eyes with wonder, 

live as if you'd drop dead in ten seconds. 

See the world.

The question is not, 

'Can they reason?'
nor, 

'Can they talk?' 

but rather, 

'Can they suffer?'

Science must begin with myths, 

and with the criticism of myths.

Beauty is eternity gazing at itself in a mirror.

A powerful idea communicates some of its strength to him who challenges it.

Poetry is finer and more philosophical than history; 

for poetry expresses the universal, 

and history only the particular.

The doorstep to the temple of wisdom 

is a knowledge of our own ignorance.

There's so much more to a book 

than just the reading.

There are things known 

and there are things unknown, 

and in between 

are the doors of perception.

Every truth has two sides; 

it is as well to look at both, 

before we commit ourselves to either.

You forget that the fruits belong to all 

and that the land belongs to no one.

The fact that our task is exactly commensurate with our life 

gives it the appearance of being infinite.

On the spiritual theory, 

man consists essentially of a spiritual nature or mind 

intimately associated with a spiritual body or soul, 

both of which are developed in 

and by means of 

a material organism.