To know and not to act is not to know.

To know and not to act is not to know.

The sages do not consider that making no mistakes is a blessing. They believe, rather, that the great virtue of man lies in his ability to correct his mistakes and continually make a new man of himself.

The inferior man attempts a hundred intrigues in order to save himself, but finishes only in creating a greater calamity from which he cannot run.

Knowledge is the beginning of practice; doing is the completion of knowing.

Yin and Yang are one vital force -- the primordial aura.