Orison Swett Marden quotes
We are the victors of our opponents. They have developed in us the very power by which we overcome them. Without their opposition we could never have braced and anchored and fortified ourselves, as the oak is braced and anchored for its thousand battles with the tempests. Our trials, our sorrows, and our griefs develop us in a similar way.
Pushing to the Front or, Success Under Difficulties (1894)