Why Napoleon Hill (Think and Grow Rich) worked for 20 years without compensation for Andrew Carnegie, the richest man at that time?

The goal was set: To write the first practical philosophy of personal success and achievement. Andrew Carnegie offered Napoleon Hill the job to write it and Napoleon Hill accepted.

Many different stories are told about the legendary meeting of young reporter Napoleon Hill with steel-magnate and philanthropist Andrew Carnegie. Click the link below and read the story told by Napoleon Hill himself. Surely, the meeting's highlight was Andrew Carnegie's proposal to Napoleon Hill:

"Are you willing to put in 20 years of research, because that’s how long it will take, paying your own way as you go along without any subsidy from me – yes or no?”

Read the full story here: Napoleon Hill about his meeting with Andrew Carnegie