"Not purpose but chance is at the heart of mental life."

“It is not the citizen, or a taxpayer, or voter, or office-holder, but the cultivated, free individual who is the true aim of all social progress.”

“It is time that the medical and teaching profession should realize that functional neurosis is not congenital, not inborn, not hereditary, but is the result of a defective, fear-inspiring education in early child life.”

“The tendency of life is not the preservation of the species, but solely the preservation of each individual organism, as long as it is in existence at all, and is able to carry on its life processes.”

“The course of evolution is to a greater integration of similarly functioning ganglia.”

“The Boris Sidis Archive at the Sidis website”

“The general tendency of evolution is from structure to function, from bondage to freedom of the individual elements.”