“Powerful indeed is the empire of habit.”
Maxim 305
Sentences, The Moral Sayings of Publius Syrus, a Roman Slave
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Publilio Siro 112
Latin writerRelated quotes

“It is difficult to exaggerate the power of habit.”
Guitar Craft Monograph III: Aphorisms, Oct. 27 1988

“"Lord Dong is not the only man of power in the empire."”
Response in 189 to threats by Dong Zhuo. After this, Yuan Shao left the capital and began organising a coalition against Dong. This confrontation marked the end of the uneasy peace between the two. Source: "Xiandi Chunqiu" (獻帝春秋), page 190 of Sanguo Zhi (三國志).
“Habit and routine have an unbelievable power to waste and destroy.”
Source: Paradoxes of Faith (1987), Ch. V. "Spirit", p. 58
“To live, indeed, is not in our power; but to live rightly is.”
Sentences of Sextus

L'imagination (Imagination: A Psychological Critique) http://encarta.msn.com/quote_561556153/Imagination_Imagination_is_not_an_empirical_or.html (1936)

Source: Elements of the Philosophy of the Human Mind, 1792, p. 334 (in 1829 edition https://books.google.nl/books?id=VxtSAAAAMAAJ)