Which lines in this excerpt from act ii, scene iv, of twelfth night suggest that a woman is inconstant in love?
duke: there is no woman's sides
can bide the beating of so strong a passion
as love doth give my heart; no woman's heart
so big, to hold so much; they lack retention.
alas, their love may be call'd appetite,
no motion of the liver, but the palate,
that suffer surfeit, cloyment and revolt;
but mine is all as hungry as the sea,
and can digest as much: make no compare
between that love a woman can bear me
and that i owe olivia.

viola: ay, but i know—

duke: what dost thou know?

viola: too well what love women to men may owe:
in faith, they are as true of heart as we.
my father had a daughter loved a man,
as it might be, perhaps, were i a woman,
i should your lordship.