“If you would make anything a habit, do it.”
Habit formation is reduced to repeated action: the behavior itself is what trains the pattern.
Source details
Discourses of Epictetus, Book II, Chapter XVIII, “How we should struggle against appearances,” George Long translation; 1877 George Bell & Sons witness on Wikisource, cross-checked against Project Gutenberg #10661. This short catalog record is an excerpt of Long’s longer clause “Generally then if you would make any thing a habit, do it”; this collection lightly normalizes “any thing” to “anything.”