Who said "Knowledge of your enemy is half the battle in commerce."?

This quote is attributed to Cornelius Vanderbilt.

Knowledge of your enemy is half the battle in commerce. - Cornelius Vanderbilt

"Knowledge of your enemy is half the battle in commerce."

Cornelius Vanderbilt Knowledge

Shipping & Railroad American 1794–1877

"I have always believed that the best way to earn money is to first learn how to make it."

"The public be damned."

"Concentrate your energy, thoughts, and capital."

"I have made my money by the blood, sweat, and tears of the American working man."

"We're not just after treasure. We're preserving history."

"The mind is humanity's greatest tool."

"A tidy room reflects a tidy mind."

"You can learn a lot about a person by how they keep their space."