Laetus in praesens animus
quod ultra est oderit curare
et amara lento temperet risu.
Nihil est ab omni parte beatum.
--Horace, Odes 2.16
Translation (thanks to Amy P.):
A soul happy for the present
disdains to be concerned about what is beyond
and tempers bitterness with a slow smile.
Nothing is all ways blessed.