Yin and yang, male and female, strong and weak, rigid and tender, heaven and earth, light and darkness, thunder and lightning, cold and warmth, good and evil...the interplay of opposite principles constitutes the universe.

Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.

Never give a sword to a man who can't dance.

Past scholars studied to improve themselves; Today's scholars study to impress others.

If you make a mistake and do not correct it, this is called a mistake.

To see what is right and not to do it is want of courage, or of principle.

Before you embark on a journey of revenge, dig two graves.