This is a distich from Daniël Heinsius' emblem collection entitled Ambacht van Cupido published in 1613. You can find the book online at the Emblem Project Utrecht.
Amoris Domitrix Invidia
Si sapis, Invidiae nunquam pugnabis, Amator:
Invidiae, vincens omnia, cedit 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:
amātor, amātōris m. - lover, friend
domitrix, domitrīcis f. - she who tames, she who subdues
sapiō sapere sapīvī: be wise
amor -ōris m.: love
cēdō cēdere cessī cessum: yield
invidia -ae f.: envy, jealousy, hatred
numquam: never
omnis -e: all, every, as a whole
pūgno -āre: fight
sī: if
vincō vincere vīcī victum: conquer