Did something worth doing

When you find you did something worth doing;
An inkling that what you did mattered–just once that
You’re lacking, always will be
No matter the friends you make,
or self-help books you read, wives you take, masks you shed, rules you break.
Complete in your incompleteness:
Spreading your molecules infinitely into the universe.
Invincible!
But you are not.
Wouldn’t think for the half second you were.