Work without rest..
Either leads to illness.
All things in balance.
A teeter totter fulcrum with kids of similar weight
Moves neither up or down.
It remains poised in balance.
The natural ebb and flow of activity has a rhythm to it.
As work gains weight it sinks to the ground, only to kick off to allow rest a chance.
Up and down goes the teeter totter/seesaw.
Photo, https://commons.wikimedia.org/w/index.php?curid=508080