Lucretius,
De Rerum Natura 3.1023 (tr. J.D. Duff):
Here on earth, in short, the life of fools becomes a hell.
hic Acherusia fit stultorum denique vita.
P. Michael Brown ad loc.:
fools: i.e. non-Epicureans; the poet appropriates from the Stoics the claim that
sapientia is to be found only within his own school, whereas all outside it are stulti;
cf., e.g., V 10, where Epicurus' philosophy is hailed as sapientia. stultorum makes
clear that all the earthly torments alluded to in the passage are self-inflicted, and can
be avoided by embracing the Epicurean moral code...