time and energy
Both are limited.
We know this, but choose to forget.
To make matters worse, a large chunk of that is taken away by the mandatory. Things that have to done. These exist, like it or not. Just make sure that whatever you think is mandatory, actually is.
You'd be surprised how many of those aren't.
The rest you get to use how you choose.
So choose carefully.
You'd be surprised how much time and energy could have — how much you could do.
If you weren't so busy wasting them.