Cultivation to the mind is as necessary as food to the body.

A mind left unfed does not stay neutral. It fills with whatever is nearest, which now means whatever is built to hold attention rather than nourish it, and the result feels like thinking while being closer to grazing. Deliberate input is the difference: something chosen, hard enough to change you slightly, taken regularly rather than in bursts.

Treat it the way you treat meals rather than the way you treat projects. Twenty minutes of something demanding, most days, beats a heroic weekend every few months. Pick one book, one subject, one difficult thing, and let ordinary repetition do the work.