I think the first thing this sentence tells us is the eternity of time. Time has no beginning and no end. It has been in time since the emergence of human beings, and it will still not escape the scope of time until the extinction of human beings. , so no matter how many changes in personnel and vicissitudes of life, it will always be in the embryo of time.

Secondly, when we understand the eternity of time, we understand the relative limitations of human beings. Human life is not long. In the long river of time, it is just a fleeting moment, a short moment. A person's life will come to an end. In such a permanent time and such a short life, we should grasp our own life well, do more things we want to do, and do meaningful things, so that we can survive in the long river of time. Leave your mark and your life will not be in vain.

Hope it is useful to you