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.
Excess weakens the spirits.
Future generation is the most important thing.
To study and at times practice what one has learned, is this not a pleasure?
Learn, as if never overtaking your object, and yet as if apprehensive of losing it.
If your desire is for good, the people will be good.