First of all, here’s the correct spelling of this Latin passage, which is a quotation from Horace’s The Art of Poetry (Latin,„Epistula ad Pisones sive
de Arte Poetica liber“), lines 101-105 :
“Ut ridentibus adrident, ita flentibus adflent
humani
vultus.Si vis me flere, dolendum est
primum ipsi tibi: tum tua me infortunia laedent,
Telephe vel Peleu; male si mandata loqueris,
aut dormitabo aut ridebo.”