3 The outward sparks of her in burning fire;
in > inwardly
4 Which spent in vain, at last she told her brief, 5 That but if she did lend her short relief,
but if > unless short > immediate
6 And do her comfort, she might algates die.
do > afford (with implication of sexual service: cf. 101.51:6) algates > altogether, at any rate; hence: surely
7 But the chaste damsel, that had never proof
proof > experience
8 Of such malengin and fine forgery,
malengin > ill intent; deceit, guile fine > consummate, skilful; sheer, unadulterated forgery > fiction, mendacity