Great works are performed not by strength but by perseverance.

Big things get finished by people who kept turning up, not by people with rare bursts of power. Strength is dramatic and brief; it flares and then needs recovery. Persistence is unglamorous, works in ordinary hours, and compounds in a way intensity never manages. Most unfinished work was abandoned in a flat middle stretch rather than defeated by a hard problem.

Set the daily amount low enough that a bad day cannot break it. Thirty honest minutes you can repeat will beat a heroic weekend you will not. When motivation goes, and it will, fall back on the schedule instead of waiting to feel capable again.