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Because actions are not initiative. Actions are a reaction to changes in circumstances that become more or less comfortable for a person.

So all stories about how someone became “disciplined” are a scenario where circumstances started to bring a person so much pain that dealing with their self-sabotage became cheaper than tolerating the situation any longer. That is, it is a set of circumstances, not a skill or a decision to “take control of your life.”

In addition to this:

1. The idea of “discipline” strongly distorts the essence of goals.

When you act through “discipline,” your attention is focused on the wording of the goal. But in the past, you always know yourself worse than you will in the future. So any wording is only a guess about what may potentially make your life better.

That is, “discipline” is a risk of spending time, energy, and other resources away from the actual goal – to make life better.

And the more the structure of society has distorted your perception, the more pain you will feel while playing “discipline.”
You may also start to intentionally ignore some of your signals, seeing them as “weakness / self-sabotage, etc.” Because you will be sure that they distract you from the “chosen path / success.” While these warnings will be really important for you: it is time to take care of yourself, change the strategy and / or tactics of reaching the goal, or change something in life as a whole.

2. All this will affect how confident you can feel in the future.

Because as soon as you stop recovering, your ability to be “disciplined” / productive will also disappear. This will later lead to comparing yourself with those who supposedly managed to become “disciplined.” As a result, you may start to feel that “I’m not enough / I don’t understand how to trust myself, etc.”

People first invented “discipline,” which does not actually exist, and then started to mass-judge themselves and others by this invention, later also selling air as a “skill.”