Four Thieves

Latrones qui nobis optiam quaeque furantur, quatuor sunt: Hebetatio intellectus, discordia tollens nobis scientiam veritatis. Hic latro ape Psalmistam vocatur negotium in tenebris. Indomitae carnis lasivia, rapiens meritum integritatis, et daemonium dicitur meridianum. Favorabilis jactantia, tollens plenitudinem sanctitatis, et dicitur sagitta volans in die. Vitae hujus amor et appetentia rapiens praemium aeternitatis, et dicitur timor nocturnus. Hi sunt latrones sine intermissione insidiantes. Hugo De Sancte Victore, Miscellanea, Liber V, CXXIII, De furibus rerum nostrarum. Source: Migne PL 177.807c

There are four thieves which steal away the best things we have. The dullness of the intellect, which with its confusion takes all the understanding of truth, and this the Psalmist calls 'the business in darkness;' 1 the untamed lusts of the flesh that take away the merit of our wholeness, which is called 'the noon day demon;' 1 the delight in boasting that takes aways the fullness of holiness, which is called 'the arrow that flies by day;' 1 and the love of this life and the desire for it that steals away the eternal reward, which is called 'the nocturnal fear.' 2 These thieves plot against us without ceasing. Hugh Of Saint Victor, Miscellanea, Book 5, Chapter 123, On the thieves of what is ours. 1 Ps 90.6 2 Ps 90.5