I like this statement, as it personally reflects back to a long period of isolation and misery I was entangled into. As gloomy as it sounds, a corpse working in the dark is the reality. You get to a point where you sell your soul with no guarantee of seeing any light at the end of the tunnel. The questions should then become:
Am I wasting my time?
What should I do next?
The uncertainty has led many near the brink, or into insanity, and in many cases suicide. You see the light when you embrace the fact, through trial and error, that you're one of most well informed traders in this business.
This applies to all entrepreneurial activity. Entrepreneurs can sweat and bleed profusely, yet have nothing to show at the end of the day. Those who love only the money but not the process of working for that money will most likely fail.