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.
Is there any one maxim which ought to be acted upon throughout one's whole life? Surely the maxim of loving kindness is such: Do not unto others what you would not they should do unto you.
First and foremost, be faithful to your superiors, keep all promises, refuse the friendship of all who are not like you; and if you have made a mistake, do not be afraid of admitting the fact and amending your ways.
The silent treasuring up of knowledge; learning without satiety; and instructing others without being wearied: which one of these things belongs to me?