Yin and Yang are one vital force -- the primordial aura.
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.
To know and not to act is not to know.
Knowledge is the beginning of practice; doing is the completion of knowing.
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.