Who said "Confidence is contagious, and so is lack of confidence."?

This quote is attributed to George S. Patton.

Confidence is contagious, and so is lack of confidence. - George S. Patton

"Confidence is contagious, and so is lack of confidence."

George S. Patton Leadership

Military General American 1885–1945

"Accept everything about yourself - I mean everything. You are you and that is the beginning of all wisdom."

"Americans love to fight. All real Americans love the sting and clash of battle."

"A pint of sweat will save a gallon of blood."

"Audacity, audacity, always audacity."

"A leader must be fair and just."

"Integrity is everything."

"One must take responsibility for one's environment."

"In this house, I make the decisions"