Curiosity is one of the permanent and certain characteristics of a vigorous mind.
— Samuel Johnson

True wisdom for a general is vigorous determination.
Napoleon Bonaparte vigorous quote

The love of life is necessary to the vigorous prosecution of any undertaking.
— Samuel Johnson

Our goals can only be reached through a vehicle of a plan, in which we must fervently believe, and upon which we must vigorously act. There is no other route to success.
— Stephen A. Brennan

A vigorous five-mile walk will do more good for an unhappy but otherwise healthy adult than all the medicine and psychology in the world.
— Paul Dudley White