What you actively spend time on, and (far more difficult) what you choose not to do, who you choose not to spend time with, and who and what you decide to say no to — what you choose, then — is how you mark time. And that is all there is.
I’m actually cross posting this here and at Minimal Mac because it is just that important. Time is the most valuable and finite commodity that any living thing has in this world. Think about it, everything – you, me, people, plants, animals, even the Earth itself – has a limited and set amount of time. Even our solar system is but a minute of time in the history of the universe. The average human lifespan does not even register on the clock. In many ways, time defines life itself.
Therefore, treat it as the most precious thing in existence, because it is. Don’t squander a single second. Perhaps, even more importantly, don’t waste time regretting the time you do squander. Instead, look to how you are going to use this very moment to do something… Anything. Make a mark. Don’t worry about the next until the next comes along. This moment is far too important.