Three Sonnets of Shakespeare

Since I left you, mine eye is in my mind;
And that which governs me to go about
Doth part his function and is partly blind,
Seems seeing, but effectually is out;
For it no form delivers to the heart
Of bird of flower, or shape, which it doth latch:
Of his quick objects hath the mind no part,
Nor his own vision holds what it doth catch:
For if it see the rudest or gentlest sight,
The most sweet favour or deformed'st creature,
The mountain or the sea, the day or night,
The crow or dove, it shapes them to your feature:
  Incapable of more, replete with you,
  My most true mind thus makes mine eye untrue.

The little Love-god lying once asleep,
Laid by his side his heart-inflaming brand,
Whilst many nymphs that vow'd chaste life to keep
Came tripping by; but in her maiden hand
The fairest votary took up that fire
Which many legions of true hearts had warm'd;
And so the general of hot desire
Was, sleeping, by a virgin hand disarm'd.
This brand she quenched in a cool well by,
Which from Love's fire took heat perpetual,
Growing a bath and healthful remedy,
For men diseas'd; but I, my mistress' thrall,
    Came there for cure and this by that I prove,
    Love's fire heats water, water cools not love. 

Music to hear, why hear'st thou music sadly?
Sweets with sweets war not, joy delights in joy.
Why lovest thou that which thou receivest not gladly,
Or else receivest with pleasure thine annoy?
If the true concord of well-tunèd sounds,
By unions married, do offend thine ear,
They do but sweetly chide thee, who confounds
In singleness the parts that thou shouldst bear.
Mark how one string, sweet husband to another,
Strikes each in each by mutual ordering,
Resembling sire and child and happy mother,
Who, all in one, one pleasing note do sing.
  Whose speechless song, being many, seeming one,
  Sings this to thee: "Thou single wilt prove none."