For the sight, being very vigorous and active, together with the spirit upon which it depends, sends forth a strange fiery power; so that by it men act and suffer very much, and are always proportionably pleased or displeased, according as the visible objects are agreeable or not.

Love, that greatest and most violent passion of the soul, takes its beginning from the eye; so that a lover, when he looks upon the fair, flows out as it were, and seems to mix with her.

And therefore why should any one, that believes men can be affected and prejudiced by the sight, imagine that they cannot act and hurt is well?
For the mutual looks of mature beauties, and that which comes from the eye, whether light or a stream of spirits, melt and dissolve the lovers with a pleasing pain, which they call the bittersweet of love.

For neither by touching or hearing the voice of their beloved are they so much wounded and wrought upon, as by looking and being looked upon again.

There is such a communication, such a flame raised by one glance, that those must be altogether unacquainted with love that wonder at the Median naphtha, that takes fire at a distance from the flame.