This poem is from the proverbial distichs of Georgius Carolides (1569-1612), which you can read online at the University of Mannheim.
Nil Ultra Vires
Ne te effer nimium, maioraque viribus aude:
Quod potes, id studio perfice; tutus eris.
The vocabulary is keyed to the DCC Latin Vocabulary list. There are two words in this poem that are not on the DCC list:
efferō, efferre: lift up, raise, exalt
perficiō, perficere: bring to a conclusion, accomplish
audeō audēre ausus sum: dare, be eager
is ea id: he, she, it
māior -ius: greater, older; maiōres -um: ancestors
nē: lest, that not
nihil, nīl: nothing; not at all
nimius -a -um: too much, excessive; nimis or nimium: excessively
possum posse potuī: be able
que (enclitic) - and
qui quae quod: who, which, what / quis quid: who? what? which?
studium -ī n.: eagerness, zeal
sum, esse, fuī: be, exist
tū tuī tibi tē: you (sing.)
tutus -a -um: safe, protected
ultrā: beyond, further (adv. and prep. + acc.)
vīs f.: force; (acc.) vim, (abl.) vī; (pl.) vīrēs, strength