Zeng Guofan, a famous minister in yat sen villa, has the reputation of "the first perfect person in history"! "Things come in line, the future doesn't, then don't mix, love too much" is also Zeng Guofan's motto.
So, how to understand the mantra of 16? In fact, the literal meaning of this sentence is: adapt to what has happened, don't worry too much about the future, focus on what you want to do, and don't miss what has happened.