A Midsummer Night's Dream, Act I, Scene I.

From Helena's soliloquy at the end of the scene:

How happy some o'er other some can be!
Through Athens I am thought as fair as she.
But what of that? Demetrius thinks not so;
He will not know what all but he do know:
And as he errs, doting on Hermia's eyes,
So I, admiring of his qualities:
Things base and vile, folding no quantity,
Love can transpose to form and dignity:
Love looks not with the eyes, but with the mind;
And therefore is wing'd Cupid painted blind:
Nor hath Love's mind of any judgement taste;
Wings and no eyes figure unheedy haste:
And therefore is Love said to be a child,
Because in choice he is so oft beguiled.

Note that Hermia is a diminutive form of Hermione.