I found this poem in the collection Philosophia Patrum edited by Julius Wegeler.
Potestas, Pietas
Utilis est pietas plus quam terrena potestas;
Nemo potestate salvatur, sed pietate.
The vocabulary is keyed to the DCC Latin Vocabulary list. There are two words in this poem that are not on the DCC list:
salvō, salvāre: save
terrēnus, -a, -um: earthly, of the earth
nēmo: no one (gen. nullius, dat. nulli, abl. nullo or nulla > nullus -a -um)
pietās -tātis f.: sense of duty, devotion, esp. between parents and children
plūs plūris n.: a greater amount or number, more
potestās -ātis f.: power
quam: how?; (after comparative) than
sed: but
sum, esse, fuī: be, exist
utilis -e: useful