2 To do him ease, or do him remedy:
do > cause; hence: give
3 Many restoratives of virtues rare,
virtues > powers; occult powers rare > excellent, fine; unusual
4 And costly cordials she did apply, 5 To mitigate his stubborn malady: 6 But that sweet cordial, which can restore
cordial > (The word is derived ultimately from the Latin cor, heart)
7 A love-sick heart, she did to him envy;
to him envy > begrudge him; hence: deny him, withhold
8 To him, and to all the unworthy world forlorn, 9 She did envy that sovereign salve, in secret store.
305.51