This is an item from Anton Moker's Decalogus metricus et paraenetica disticha, published in 1573. You can see the book at GoogleBooks.
Qui Bene Stat, Ne Cadat
Est metuenda bonae semper mutatio sortis;
Qui bene stat, videat ne titubando cadat.
The vocabulary is keyed to the DCC Latin Vocabulary list. There are two words in this poem that are not on the DCC list:
mūtātio (mūtātiōnis, f.): change, alteration
titubo, titubāre: totter, falter, stagger
bene: well
bonus -a -um: good
cadō cadere cecidī cāsum: fall, be killed
metuō metuere metuī: to fear, to dread
nē: lest, that not
qui quae quod: who, which, what / quis quid: who? what? which?
semper: always, ever
sors sortis f.: lot, fate, destiny; oracle
stō stāre stetī statum: stand
sum, esse, fuī: be, exist
videō vidēre vīdī vīsum: see
