Translation?

trying to trnslate thiese phrses into something that makes sense:
"O curas hominum! O quantum est in rebus inane!"
thought this was latin but nothing comes out right, nor in german or italian. can someone translate an give meaning?

My Latin isn't too good (I'm just a HS student, and not a particularly good one) and I don't have my latin book on me, but my not-so-educated guess would be "O cares [loves?] of man! O how it is in things inane!" I don't know how to translate "inane" but I'm guessing it means the same as the English word.