Origin Of 'Enthusiasm Unknown To Mankind'

In a speech with John, Jim and Jack Harbaugh, they discussed that famous family phrase.

[@PremSingh-ho5rk]

Wow ! Finally found the origins of some of the most inspiring words Ive ever heard ! All the way from 1972 no less .

[@rolandjersevic8339]

Yes! Wow! Way cool! It is enthusiasm that makes a difference!....believe in it!

[@daleschmitz5832]

You want to be enthusiastic? I’ll give you one more tip…act enthusiastic!