She is not fair to outward view

She is not fair to outward view
As many maidens be;
Her loveliness I never knew
Until she smiled on me.
O then I saw her eye was bright,
A well of love, a spring of light.

But now her looks are coy and cold,
To mine they ne'er reply,
And yet I cease not to behold
The love-light in her eye:
Her very frowns are fairer far
Than smiles of other maidens are.