This distich comes from the Iuvenilia of Marcus Antonius Muretus which you can find online at Google Books.
Ne Iterum
Si quis te obiurget, male cum quid feceris, illi
Gratiam habe et ne iterum queat obiurgare caveto.
The vocabulary is keyed to the DCC Latin Vocabulary list. There are two words in this poem that are not on the DCC list:
obiurgo, obiurgāre: scold, reproach
queō, quīre: be able, can
aliquis -quae -quod: some, any; si quis, si quid: anyone who, anything that
caveō cavēre cāvī cautum: be on guard, beware
cum: with (prep. + abl.); when, since, although (conjunction + subj.)
et: and
faciō facere fēcī factum: do, make
grātia -ae f.: favor, influence, gratitude
habeō habēre habuī habitum: have, hold
ille illa illud: that
iterum: again
malus -a -um: bad, evil; male: (adv.) badly
nē: lest, that not
sī: if
tū tuī tibi tē: you (sing.)