Annie Dillard said this in an essay about writing, but it could easily be said of living. You can read the entire essay here.
One of the few things I know about writing is this: spend it all, shoot
it, play it, lose it, all, right away, every time. Do not hoard what
seems good for a later place in the book, or for another book; give it,
give it all, give it now. The impulse
to save something good for a better place later is the
signal to spend it now. Something more will arise for later, something
better. These things fill from behind, from beneath, like well water.
Similarly, the impulse to keep to yourself
what you have learned is not only shameful, it is
destructive. Anything you do not give freely and abundantly becomes lost
to you. You open your safe and find ashes.