I have observed that the world has suffered far less from ignorance than from pretensions to knowledge. It is not skeptics or explorers but fanatics and ideologues who menace decency and progress. No agnostic ever burned anyone at the stake or tortured a pagan, a heretic, or an unbeliever.
The history of Western science confirms the aphorism that the great menace to progress is not ignorance but the illusion of knowledge.
Throught human history, illusions of knowledge, not ignorance, have proven to be the principal obstacles to discovery
Probably no one of us has the True Religion. But all of us together - if we are allowed to be free - are discovering ways of conversing about the great mysteries. The pretense to know all the answers to the deepest mysteries is, of course, the grossest fraud. And any people who declare a Jihad, a holy war on unbelievers - those who do not share their believers' pretended omniscience - are enemies of thinking men and woman and of civilization. I see religion as only a way of asking unanswerable questions, of sharing the joy of a community of quest, and solacing one another in our ignorance.
The great obstacle to discovering the shape of the earth, the continents, and the oceans was not ignorance, but the illusion of knowledge.