Generally, a period of ambivalence precedes change (most of the time, though there are documented cases of “quantum change” where a person undergoes a difficult change in a single moment without the usual intermediate stages and never relapses).

Ambivalence exists when a person knows in their mind reasons both for and against a change, and gives both more or less an equal mind share.

When that person begins to give an outsized share of their attention to engaging with thoughts aligned with the change, it predicts growing commitment and ultimately follow-through on the change.

The best resource I know of on this topic is “Motivational Interviewing” in its 3rd or 4th edition. It has a very extensive bibliography and the model of change it presents has proven itself an effective predictor of change in clinical practice.

Based on my understanding of that research, I’m inclined to agree with GP.

First, you can trust in the wisdom of those who came before you, i.e. scripture. Second, you could trust in tradition, which may say such things. Third, you can use reason yourself. Fourth, you could rely on personal experience.

If you tend to engage in suspicious behavior, you'll probably start regarding others with suspicion. Essentially, your actions will engender your world view.

On the other hand, the intention behind the habit/action easily twists it in actuality to something else.

I think the “fake it till you make it” I brought up upthread a great example of this. Yeah, it might end up with the fake becoming something valuable, or you building character, or whatever.

Or, the habit that is getting built isn’t positive hustle and tenacity, but just a habit of outright lying, constantly reinforcing itself.

Sometimes it’s impossible to see from the outside what is which until it breaks down.