Why is the present time most valuable? Now I'd better quote Yue Manson's words as the answer. He said; "If you love time, you'd better love the present time. The time passed will never come back to you again. Though you are not sure about the existence of tomorrow, you will be certain about it today and now. Today you will have the day, which will mean two days tomorrow."
Why is the present time easily lost? Because our universe is so vast. Because our universe turns without stopping. Because time is valuable people cherish it highly. You may ask me what you mean by the present time. What I mean is the time being now. But it passes as quick as a flash and becomes the past. What pity it is if I let it go neglectfully!
--From Li Dazhao:"The Present Time"