I keep running into the same mistake on projects: spending energy on things that won’t move. The Serenity Prayer is older than software, but it maps surprisingly well onto how to spend your time as a developer.

The Prayer

God, grant me the serenity to accept the things I cannot change.
Courage to change the things I can.
And wisdom to know the difference.

You don’t need the God part for this to be useful. What matters is the three-way split.

A Secular Version

May I find calm for what I cannot change.
May I find courage for what I can.
And may I know the difference.

Applied to a Codebase

Every codebase has things you can change and things you cannot.

Cannot change — legacy ABI contracts, the OS scheduler, a dependency you don’t own, the language your team already knows. Pushing against these burns time and goodwill. The correct response is to accept the constraint and design around it.

Can change — naming, structure, test coverage, your own habits. These are the things worth spending energy on. Yet they are often the first to be deprioritized because they don’t feel urgent.

The difference — this is the hard part. A surprising number of arguments in code review, in architecture meetings, and in bug post-mortems are really about misclassifying something. Someone fighting a constraint that is fixed. Someone accepting a constraint that is actually movable.

The Cool Stuff versus Useful Stuff problem is a variant of this. The cool stuff feels changeable because it is new. The boring stuff feels fixed because it is old. Neither feeling is reliable.

A Simple Test

Before spending more than an hour on a problem, ask:

  1. Is this actually in my control?
  2. If yes, is it worth the cost to change it?
  3. If no, what is the cheapest design that works given this constraint?

That third question is the one most people skip. They either fight the constraint or give up entirely. Designing around a fixed constraint is a skill, and it is underrated.

The prayer is just a reminder to ask the question before you start.