Only the supremely wise and the ignorant do not alter.
If you don't want to do something,don't impose on others
From a grain of sand in the Pearl comes.
The cautious seldom err.
Tsze-Kung asked, “Is there one word with which to act in accordance throughout a lifetime?” The Master said, “Is not reciprocity such a word? What you do not want done to yourself, do not do to others.
If I hold up one corner of a square and the student cannot workout the other three for himself, I won't go any further.