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In full
"Compared with what we ought to be, we are only half awake. Our fires are damped, our drafts are checked. We are making use of only a small part of our possible mental and physical resources." William James, The Energies of Men, 1907
About this line
James delivered this as his presidential address to the American Philosophical Association at Columbia University on December 28, 1906. The address was published in Science in January 1907. His argument was practical, not philosophical in the abstract sense. Most people, he observed, stop at the first threshold of effort — what he called the first layer of energy. The second wind, and the layers beyond it, go untouched. The obstruction is not capacity. It is habit: "we live habitually with a sort of cloud weighing on us, below our highest clearness, sureness, and vigor." The stove metaphor follows two sentences later: "Our fires are damped, our drafts are checked." The fuel is already laid in. What is missing is the air.
Why we carry this line
Because it is the most honest thing anyone has said about human potential — and it is not a motivational poster. James is not telling you that you can do anything. He is telling you that the supply is already in there, and something upstream is closed. That is a different kind of claim. Less inspiring. More true.