Some quotes that have to do with money, success (and lack therof), wealth and human nature in general. Latin is a suitable language for all quotes, but these seem to work particularly well.
Abite nummi, ego vos mergam, ne mergar a vobis - Away with you, money, I will sink you that I may not be sunk by you
Absque argento omnia vana - Without money all is in vain
Cornucopia - Horn of plenty
Crescit amor nummi, quantum ipsa pecunia crevit - The love of wealth grows as the wealth itself grew. (Juvenalis)
Corruptio optimi pessima - Corruption of the best is worst
Dira necessitas - The dire necessity. (Horace)
Dominus providebit - The Lord will provide
Faber est suae quisque fortunae - Every man is the artisan of his own fortune. (Appius Claudius Caecus)
Fames est optimus coquus - Hunger is the best cook
Homo doctus is se semper divitias habet - A learned man always has wealth within himself
In necessariis unitas, in dubiis libertas, in omnibus caritas - In necessary things unity, in doubtful things liberty, in all things charity
In omnia paratus - Prepared for all things
Libra solidus denarius (L.S.D.) - Pounds, shillings, pence
Magnas inter opes inops - A pauper in the midst of wealth. (Horace)
Male parta male dilabuntur - What has been wrongly gained is wrongly lost.(Cicero)
Nervos belli, pecuniam. (Nervus rerum.) - The nerve of war, money. (The nerve of things.) (Cicero)
Nihil tam munitum quod non expugnari pecunia possit - No fort is so strong that it cannot be taken with money. (Cicero)
Pecunia non olet - Money has no smell. Money doesn't stink. (don't look a gift horse in the mouth) (Vespasianus)
Pecuniate obediunt omnia - All things obey money
Radix omnium malorum est cupiditas - The love of money is the root of all evil. Avarice is the problem, money itself is not evil
Semper inops quicumque cupit - Whoever desires is always poor. (Claudian)