"The freedom of the seemingly false opinion and our tolerance of it and our willingness to meet with it in the open help test the validity of truth while keeping alive the critical sense which is the main spring of all advancement of human thought and is the vital point, the very soul, of all human progress."

“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.”