This poem is from the Hortulus Carminum Selectorum by Josephus Perez (1627-1694).
Velle Tuum Moderandum
Quanto maior eris, moderatior esse teneris,
Nam cito stultus eris nisi velle tuum modereris.
The vocabulary is keyed to the DCC Latin Vocabulary list. There are two words in this poem that are not on the DCC list:
moderor, moderārī, moderātus: set boundaries, limit
stultus, -a, -um: foolish, silly; fool
cītus -a -um: swift; citō swiftly
māior -ius: greater, older; maiōres -um: ancestors
nam or namque: for, indeed, really
nisi/nī: if not, unless
quantus -a -um: (interr.) how great? (rel.) of what size, amount, etc.
sum, esse, fuī: be, exist
teneō -ēre -uī tentum: hold
tuus -a -um: your
volō velle voluī: wish, be willing