Juvenal
Anglicized as Juvenal, was a Roman satiric poet.
Haut facile emergunt quorum virtutibus opstat
res angusta domi.
Nam si tibi sidera cessant,
nil faciet longi mensura incognita nervi,
quamvis te nudum spumanti Virro labello
viderit et blandae adsidue densaeque tabellae
sollicitent, autos gar ephelketai andra kinaidos.
The original context is that a husband might lock his wife in the house to prevent her adulteries, but she is cunning and will start with the guards; hence, who guards the guards? The phrase has come to be applied broadly to people or organisations acting against dishonesty or corruption, esp. in public life. See Quis custodiet ipsos custodes? at Wikipedia.
Nemo repente fuit turpissimus.
The hardest thing to bear in poverty is the fact that it makes men ridiculous.
Cantabit vacuus coram latrone viator.
Summum crede nefas animam praeferre pudori
et propter vitam vivendi perdere causas.
Maxima debetur puero reverentia.
Poena tamen praesens, cum tu deponis amictus
turgidus et crudum pavonem in balnea portas.
hinc subitae mortes atque intestata senectus;
it nova nec tristis per cunctas fabula cenas:
ducitur iratis plaudendum funus amicis.
Hic vivimus ambitiosa paupertate omnes.
Orandum est ut sit mens sana in corpore sano.
Wretched poverty offers nothing harsher than this: it makes men ridiculous.
Nobilitas sola est atque unica virtus.
Sed quis custodiet ipsos custodes?
Nam qui dabat olim
imperium, fasces, legiones, omnia, nunc se
continet atque duas tantum res anxius optat,
panem et circenses.
No one shall be a thief by my co-operation.
Nil habet infelix paupertas durius in se,
quam quod ridiculos homines facit.
Nunc patimur longae pacis mala, saevior armis
luxuria incubuit victumque ulciscitur orbem.
Dat veniam corvis, vexat censura columbas.