From Epistle 2. Of the Nature and State of Man With Respect to Himself, as an Individual

1. Know then thyself, presume not God to scan;
The proper study of mankind is Man.
Placed on this isthmus of a middle state,
A being darkly wise, and rudely great:
With too much knowledge for the skeptic side,
With too much weakness for the Stoic’s pride,
He hangs between; in doubt to act, or rest,
In doubt to deem himself a god, or beast;
In doubt his  mind or body to prefer,
Born but to die, and reasoning but to err;
Alike in ignorance, his reason such,
Whether he thinks too little, or too much:
Chaos of thought and passion, all confused;
Still by himself abused, or disabused;
Created half to rise, and half to fall;
Great lord of all things, yet a prey to all;
Sole judge of truth, in endless error hurled:
The glory, jest, and riddle of the world!

-Alexander Pope