William Shakespeare, Sonnet 129

Th' expense of spirit in a waste of shame
Is lust in action; and, till action, lust
Is perjured, murd'rous, bloody, full of blame,
Savage, extreme, rude, cruel, not to trust;
Enjoyed no sooner but despisèd straight;
Past reason hunted, and no sooner had,
Past reason hated, as a swallowed bait
On purpose laid to make the taker mad;
Mad in pursuit, and in possession so;
Had, having, and in quest to have, extreme;
A bliss in proof--and proved, a very woe;
Before, a joy proposed; behind, a dream.
    All this the world well  knows; yet none knows well
    To shun the heaven that leads men to this hell.