This sentence means that everything should go with the flow, face it calmly, live in the present, don't care too much about what hasn't happened in the future, do what is in front of you, and don't miss and entangle what has happened.
The original text of this sentence comes from the book Quotations of Zeng Hubing cataloged by General Cai E: "When reading, you don't have to meet guests; See the guests, see the guests, and have no intention of reading. Once you have it, it is private. There is nothing in the spirit, and things come in line with it, but the future does not. At that time, it was not mixed, neither love nor love. "
Throughout the ages, people who have achieved great things are not limited to details, but start from details; Don't waste time, just cherish the present; Can afford it and put it down.