Because it is a limited depreciating asset and you cannot buy more of it. Use it or lose it.
Why is time is important for us?
When you're in jail or prison time is everything
Oh wow ! I'm not into time, man. ~~~~ Tommy Chong. LOL
Mainly because when we are born , we are given only so long to make a lasting good impression upon Earth and when it runs out, its all over for us and time to move on. None of us knows how long we are given so best make the most of what we think we have. But it seems that the bad have more time than the good do. We are not given the opportunity to buy or trade time units so if we choose to waste them then its truly sad but if we do some everlasting good, then we will be remembered long after we are gone. So live for today as none of us are promised tomorrow
For contemplation at your leisure.
One definition of time is "the measurement of things that change."
As an adjunct to the river analogy, check out this link: www.psychologytoday.com/blog/chronic-healing/201307/dont-pus
Time might be compared to a large, swift river. It is ever flowing forward. You cannot stop it, nor can you use every drop that flows by. Centuries ago, people began building waterwheels on riverbanks. With them, they harnessed energy from the flowing water to operate their grindstones, sawmills, pumps, and hammers.
Similarly, you can harness time, not to save it, but to use it to accomplish good work. Because time wait for no one. Indeed, time flows relentlessly forward like a steady stream. It cannot be reversed or saved; once it is gone, it is gone forever.
Time helps us know when you have to do a certain thing. Without clocks there would be no time so time is a good thing .
Because it never stops for anybody and the time which passes never come again. So do whatever you want to do in time.