This rhyming distich comes from the Florilegium Gottingense edited by Voigt.
Vetitum Acrius Urit
Nitimur in vetitum semper cupimusque negatum:
Quod licet, ingratum est; quod non licet, acrius urit.
The vocabulary is keyed to the DCC Latin Vocabulary list. There are two words in this poem that are not on the DCC list:
nītor, nītī: press, struggle, strive
ūro, ūrere: burn, inflame, scorch
ācer ācre ācre: sharp, piercing
cupiō -ere -īvī -ītum: desire
in: in, on (+ abl.); into, onto (+ acc)
ingrātus -a -um: unpleasant, disagreeable
licet licuit licitum est: it is permitted (+ dat. of person + infin.); conj. licet: even though
negō -āre: deny, refuse
nōn: not
que (enclitic) - and
qui quae quod: who, which, what / quis quid: who? what? which?
semper: always, ever
sum, esse, fuī: be, exist
vetō -āre vetuī vetītum: forbid