This distich comes from the Florilegium Gottingense edited by Voigt.
Tranquillis rebus, quae sunt adversa, caveto;
Rursus in adversis melius sperare memento.
The vocabulary is keyed to the DCC Latin Vocabulary list. There is only one word in this poem that is not on the DCC list:
tranquillus -a -um - calm, quiet, tranquil
adversus -a -um: turned towards, facing, opposed; unfavorable
caveo -ēre cāvī cautum: be on guard, beware
melior -ius: better
meminī meminisse: remember, recollect
qui, quae, quod: who, which, what; quis quid: who? what? which?
rēs reī f.: thing (rēs pūblica, commonwealth; rēs familiāris, family property, estate; rēs mīlitāris, art of war; rēs novae, revolution)
rūrsus: back, again
spēro -āre: to hope
sum, esse, fuī: be, exist