Attention is the most valuable and limited resource
Jason Fried :
Every day you spend more time, and tomorrow you have less than you had yesterday. You can’t make more, and you can’t really buy more, so it’s limited and fleeting and those are the rules.
But there’s something even more limited than time. It’s your attention. Attention is a subset of time, therefore it’s more limited. How you spend your attention is more important than how you spend your time.