When you think about it, let is a beautiful word. In latin it’s translated from a subjunctive verb in a jussive clause, which means the main verb of the phrase has a subordinate idea but acts like a main verb because it implies an order to do something else.
"Let" encapsulates the idea of allowing something, and inherent freedom. Yet it’s not something that can be done on its own. You have to "let" something else happen.
Let it be.
Let the rain fall.
Let me come home.
Let it go.
We make an active choice to be passive, whether for good or ill. Let it always be for good.