Bhagavad Gita, Chapter 6, Verse 17

To him who is temperate in eating and recreation, in his effort for work, and in sleep and wakefulness, Yoga becomes the destroyer of misery.

Moderation in the ordinary parts of a day is groundwork, not a side habit.

This builds directly on the last verse. A life kept in reasonable balance, not swinging between extremes, is described as the foundation that lets deeper practice take hold.