St. John Climacus
“Avarice is said to be the root of all evil (1 Tim. 6:10), and it is so because it causes hatred, theft, envy, separation, hostility, stormy blasts, remembrance of past wrongs, inhuman acts and even murder. A small fire can burn down an entire forest. But one virtue can help many to escape all the vices mentioned above. That virtue is detachment, which is a withdrawal from all evil desires, and which grows from an experience and taste of the knowledge of God and from a meditation on the account to be rendered at death.”
Source: St. John Climacus, The Ladder of Divine Ascent