Consistency becomes real when conditions stop being identical.

Anyone can keep a routine during a good month. It is only when the conditions change, when you are tired or travelling or carrying something heavy, that you find out whether the thing was real or whether it was being held up by favourable circumstances. Difficulty is not the enemy of consistency. It is the test that reveals it.

The next time conditions turn against you, treat it as the interesting part rather than the interruption. See what version of the practice survives. Whatever survives is the part you actually own.