Authors:

No man has a right to expect to succeed in life unless he understands his business, and nobody can understand his business thoroughly unless he learns it by personal application and experience.

P. T. Barnum (1999). “Art of Money Getting”, p.45, Applewood Books
No man has a right to expect to succeed in life unless he understands his business, and nobody can understand his business thoroughly unless he learns it by personal application and experience.