The mind of a bigot is like the pupil of the eye; the more light you pour upon it, the more it will contract.
The breakfast-table series: The autocrat, The professor, and The poet (T. Nelson and Sons, 1906), p. 115. It is slightly different on the original work: "It was that of the mind of a bigot to the pupil of the eye ; the more light you pour on it, the more it contracts."