All types of knowledge, ultimately mean self knowledge.

The consciousness of self is the greatest hindrance to the proper execution of all physical action.

It's the law of averages: put in more, come out with more.

Notice that the stiffest tree is most easily cracked, while the bamboo or willow survives by bending with the wind.

He who wants to succeed should learn how to fight, to strive and to suffer. You can acquire a lot in life, if you are prepared to give up a lot to get it.

To live is to express oneself freely

One should be in harmony with, not in opposition to, the strength and force of the opposition. This means that one should do nothing that is not natural or spontaneous; the important thing is not to strain in any way.