Poor is the person without Slack. Lack of Slack compounds and traps.
Slack means margin for error. You can relax.
[…]
Slack permits planning for the long term. You can invest.
Slack enables doing things for your own amusement. You can play games. You can have fun.
Slack enables doing the right thing. Stand by your friends. Reward the worthy. Punish the wicked. You can have a code.
Slack presents things as they are without concern for how things look or what others think. You can be honest.
— Slack by Zvi Mowshowitz
See also: Post 38: On Slack - Having room to be excited by Neel Nanda