William H. Herndon, Jesse William Weik, Herndon's Lincoln: The True Story of a Great Life, Etiam in minimis major, The History and Personal Recollections of Abraham Lincoln by William H. Herndon, for twenty years his friend and Jesse William Weik

By reason of his practical turn of mind Mr. Lincoln never speculated any more in the scientific and philisophical than he did in the financial world. He never undertook to fathom the intricacies of psychology and metaphysics.¹ Investigation into first causes, abstruse mental phenomena, the science of being, he brushed aside as trash — mere scientific absurdities. He discovered through experience that his mind, like the minds of other men, had its limitations, and hence he economized his forces and his time by applying his powers in the field of the practical. Scientifically regarded he was a realist as opposed to an idealist, a sensationist as opposed to an intuitionist, a materialist as opposed to a spiritualist.

There was more or less superstition in his nature, and, although he may not have believed implicitly in the signs of his many dreams, he was constantly endeavoring to unravel them. His mind was readily impressed with some of the most absurd superstitions. His visit to the Voodoo fortuneteller