This poem is by the 12th-century poet Godfrey of Winchester:
Virtuti Modus Adhibendus
Virtutis studio nimius, Crysippe, videris,
Virtus absque modo nomen habet vitii.
The vocabulary is keyed to the DCC Latin Vocabulary list. There are two words in this poem that are not on the DCC list:
absque: without, apart from, away from
Crȳsippus (Crȳsippī, m.): Crysippus
adhibeō -hibēre -hibuī -hibitum: apply
habeō habēre habuī habitum: have, hold
modus -ī m.: measure, manner, kind
nimius -a -um: too much, excessive; nimis or nimium: excessively
nōmen -inis n.: name
studium -ī n.: eagerness, zeal
videō vidēre vīdī vīsum: see
virtūs -ūtis f.: valor, manliness, virtue
vitium -ī n.: flaw, fault, crime