"Because there is nothing to do, so let nature take its course. Because I have nothing to fear, I am happy about it. " What do you mean?

These two sentences mean: let nature take its course, and everything goes with fate.

Because there is nothing we can do, letting nature take its course means that there is little room for people to exert their subjective initiative in nature or society, and they cannot make greater changes to the present situation of the object. In this case, instead of resisting in vain, it is better to follow the trend, let nature take its course, and respond to changes with constancy, so as to reach the realm of "governing by doing nothing" as Lao Tzu said.

Because having nothing to do with your heart means that even if you no longer have extravagant hopes and prayers for everything, there is nothing to rely on to change the status quo, so don't be blindly pessimistic, complain about fate or even despise yourself. On the contrary, what is needed at this time is a normal heart, a cheerful attitude, and an open-minded realm to laugh at the changing situation. First of all, we should "take things as they are".

The meaning expressed by these two sentences seems pessimistic, but in fact the realm is quite high, which is a wise self-protection move in the face of powerful external forces. This move is far better than "the egg hits the stone" and "knowing that you can't do it."