This is a distich from Daniël Heinsius' emblem collection entitled Quaeris quid sit amor? (sometimes also titled: Emblemata amatoria) published c. 1601. You can find the book online at the Emblem Project Utrecht.
Omnia Vincit Amor
Vidi ego qui durum possit frenare leonem;
Vidi qui solus corda domaret: Amor.
The vocabulary is keyed to the DCC Latin Vocabulary list. There are only three words in this poem that are not on the DCC list:
domō -āre, domuī, domitum - tame, subdue, master
frēnō, -āre - bridle, restrain, curb
leo -ōnis m./f.: lion
amor -ōris m.: love
cor cordis n.: heart; cordī est, it is pleasing to (+ dat.)
dūrus -a -um: hard, tough, harsh
ego meī mihi mē: I, me
omnis -e: all, every, as a whole
possum posse potuī: be able
qui quae quod: who, which, what / quis quid: who? what? which?
sōlus -a -um: only, alone; sōlum (adv.), only, merely
videō vidēre vīdī vīsum: see
vincō vincere vīcī victum: conquer