World-renowned former Navy Seal Jocko Willink coined the phrase “discipline equals freedom”.
It seems counter-intuitive that being more stringent leads to liberation. But financial discipline gives you more money and choices, a disciplined time-management system allows you to be spontaneous and more free with your schedule, and a disciplined nutrition and exercise regimen keeps you free from health issues.
We have adequate control over many of the variables we care about. The amount of freedom we have is simply the result of operational effectiveness of disciplined systems.