avarice, a demon clearly foreign to our nature, who only gains entry into a monk because he is lacking in faith… it is ‘the root of all evil’ (1 Tim. 6:10).
Cassian’s foundational thesis that avarice is uniquely exogenous among the passions, entering from outside rather than arising from embodied nature, yet capable of becoming more destructive than all other vices once established.
, The Philokalia, Volume 4, 1995thesis