Three unprofessional plum blossom easy number learning

In light occupation, there is a principle of "three no occupations". That is: no reason, no difference, no doubt.

The occurrence and development of things are carried out under normal conditions, so only when things are in variation will the "machine" that cuts into their development and change be exposed. This is what the ancients said: "If you don't think, ghosts and gods don't know."