“Our greatest challenge today...is to couple conviction with doubt. By conviction, I mean some pragmatically developed faith, trust, or centeredness; and by doubt I mean openness to the ongoing changeability, mystery, and fallibility of the conviction.”

“But then with me the horrid doubt always arises whether the convictions of man's mind, which has been developed from the mind of the lower animals, are of any value or at all trustworthy. Would any one trust in the convictions of a monkey's mind, if there are any convictions in such a mind?[To William Graham 3 July 1881]”

“This is because conviction and humility, like faith and doubt, are not opposites; they’re dance partners. It’s possible to hold your faith with open hands, living with great conviction and yet at the same time humbly admitting that your knowledge and perspective will always be limited.”

“Doubt was much more energy efficient than conviction.”

“Doubt begets understanding, and understanding begets compassion. Verily, it is conviction that kills.”

“The challenges in our lives are there to STRENGTHEN our CONVICTIONS. They are NOT there to run us over.”