An unlearned carpenter of my acquaintance once said in my hearing: “There is very little difference between one man and another, but what little there is is very important.” This distinction seems to me to go to the root of the matter. It is not only the size of the difference which concerns the philosopher, but also its place and its kind.

William James (1842-1910) American psychologist and philosopher

“The Importance of Individuals,” The Will to Believe: And Other Essays in Popular Philosophy (1897)