Put Off Your Imagination, As You Put

When Entering On New Ground We Must Not Be Afraid To Express Even Risky Ideas So As To Stimulate Research In All Directions. As Priestley Put It, We Must Not Remain Inactive Through False Modesty Based On Fear Of Being Mistaken.

Il Ne Fallait Jamais Faire Des Expériences Pour Confirmer Ses Idées, Mais Simplement Pour Les Contrôler. We Must Never Make Experiments To Confirm Our Ideas, But Simply To Control Them.

The Great Experimental Principle, Then, Is Doubt, That Philosophic Doubt Which Leaves To The Mind Its Freedom And Initiative, And From Which The Virtues Most Valuable To Investigators In Physiology And Medicine Are Derived.

Well-observed Facts, Though Brought To Light By Passing Theories, Will Never Die; They Are The Material On Which Alone The House Of Science Will At Last Be Built.

In Every Enterprise ... The Mind Is Always Reasoning, And, Even When We Seem To Act Without A Motive, An Instinctive Logic Still Directs The Mind. Only We Are Not Aware Of It, Because We Begin By Reasoning Before We Know Or Say That We Are Reasoning, Just As We Begin By Speaking Before We Observe That We Are Speaking, And Just As We Begin By Seeing And Hearing Before We Know What We See Or What We Hear.