It Doesn't Serve Me

I'm finding myself enamored with the phrase "it doesn't serve me" when trying to make good decisions, set boundaries, or treat myself well. It makes it so that things are not a question of good or bad, healthy or detrimental, right or wrong... all of which can be difficult to quantify or convince myself of.

But does something serve me? Does it improve my life? Is it useful for me?

• Ex: I could spend a lot of time berating myself for a small mistake, but does that serve me? No. It won't change the decision, it won't help me learn from the mistake. It will only serve to make me upset, to hurt me, and to make me freeze in my growth.
• Ex: I am angry with Person A for doing [this thing], but that thing happened 6 years ago, and we haven't spoken since. I will never gain further closure on this subject. Does it serve me to hold onto or ruminate over that anger? No. It takes my time and energy and makes me relive the pain of whatever happened. I don't have to forgive them, but I don't have to give them any more than I already have.