This is an item from Anton Moker's Decalogus metricus et paraenetica disticha, published in 1573. You can see the book at GoogleBooks.
Mutantur mores, quando cumulantur honores;
Peiores fieri saepius inde solent.
The vocabulary is keyed to the DCC Latin Vocabulary list. There are two words in this poem that are not on the DCC list:
cumulō, cumulāre: heap up, accumulate
pēior, pēius (pēiōris): worse
fīō fierī factus sum: become
honor -ōris m.: honor, glory; office, post
inde: from there, from then
mōs mōris m.: custom, habit; (pl.) character
mūtō -āre: change
quandō: when?; since; si quando: if ever
soleō -ēre -uī -itum: be accustomed