This is an item from Anton Moker's Decalogus metricus et paraenetica disticha, published in 1573. You can see the book at GoogleBooks.
Quae sunt in tenebris veniunt aliquando sub auras;
Clam nihil est adeo quin patefiat idem.
The vocabulary is keyed to the DCC Latin Vocabulary list. There are two words in this poem that are not on the DCC list:
clam: in secret, covertly
patefiō, patefiērī: come to light, be revealed
adeō: (adv.) to such a degree, so
aliquandō: at some time, at length
aura -ae f.: breeze
īdem eadem idem: the same
in: in, on (+ abl.); into, onto (+ acc)
nihil, nīl: nothing; not at all
omnis -e: all, every, as a whole
qui quae quod: who, which, what / quis quid: who? what? which?
quīn: (adv.) indeed, in fact; (conjunction) so that . . . not (+ subj.)
sub: under, close to (+acc. or abl.)
sum, esse, fuī: be, exist
tenebrae -brārum f. pl.: darkness, the shadows
veniō venīre vēnī ventum: come