习惯成自然

Explanation: Used to be a natural thing. 　　Usage: The main predicate; as object clause; means of learning for a long time into 　　Source: "Han Jia Yi Chuan," less as if nature, habits such as natural. " 　　Examples: Regulation and for and in order to seek, find balance, find the natural - here is the so-called ~ "★ qing" Men " Thesaurus:  way artlessness, Habits and sex into, deeply ingrained into one's nature