He who is not contented 

with what he has, 

would not be contented 

with what he would like to have.

The key to wisdom is this — 

constant and frequent questioning, 

for by doubting 

we are led to question 

and by questioning 

we arrive at the truth.

The only defence against the world 

is a thorough knowledge of it.

To hate, to love, to think, to feel, to see; 

all this is nothing but to perceive.

Nothing is more active than thought, 

for it travels over the universe, 

and nothing is stronger than necessity 

for all must submit to it.

Ideas are like stars; 

you will not succeed in touching them with your hands. 

But like the seafaring man on the desert of waters, 

you choose them as your guides, 

and following them 

you will reach your destiny.

One should as a rule respect public opinion 

in so far as is necessary to avoid starvation 

and to keep out of prison, 

but anything that goes beyond this 

is voluntary submission to an unnecessary tyranny, 

and is likely to interfere with happiness in all kinds of ways.

Art is the imposing of a pattern on experience, 

and our aesthetic enjoyment is recognition of the pattern.

Vivere est Cogitare

刚下过雨又要下雨的云

We are what we repeatedly do. 

Excellence, then, is not an act, but a habit.