Have you ever had a bad month and blamed your character for it?

If you are a violin, your chemistry is the wood. It does not decide what you play. It decides how loud joy gets, how long fear rings on after the event that caused it, and how quickly either one dies away.

Your mood is not a decision. It is an acoustic.

This is why the same week lands so differently on two people, and why the same week lands differently on you in March and in September. Almost nobody accounts for it. They take the sound personally and never once look at the instrument.

You have been trying to win an argument with your own chemistry, and calling the loss a character flaw.

So the resolutions fail, the discipline seems to evaporate, and the conclusion drawn is always about willpower. It is very rarely about willpower. Wood that has dried out does not need to be shouted at.

Discipline is tension. Too much of it and the string does not sing — it snaps.

Fix the instrument and half of what you called your personality quietly changes its mind.

April tells you the how in fourteen pages.

Including the cheapest credible way to correct each one — food, light, load and sleep first, supplements last — and which tests are worth booking now versus later. Nothing here is a diagnosis, and no number is presented as a measurement of your blood.