This is an item from Anton Moker's Decalogus metricus et paraenetica disticha, published in 1573. You can see the book at GoogleBooks.
Omne Nimium Nocet
Omne nocet nimium; nequeunt moderata nocere:
Naturae nimium est res inimica bonae.
The vocabulary is keyed to the DCC Latin Vocabulary list. There are two words in this poem that are not on the DCC list:
moderātus, -a, -um: limited, bounded
nequeō, nequīre: be unable, cannot
bonus -a -um: good
inimīcus -a -um: unfriendly
nātūra -ae f.: nature
nimius -a -um: too much, excessive; nimis or nimium: excessively
noceō nocēre nocuī: harm
omnis -e: all, every, as a whole
rēs reī f.: thing (rēs pūblica, commonwealth; rēs familiāris, family property, estate; rēs mīlitāris, art of war; rēs novae, revolution)
sum, esse, fuī: be, exist