I recently came across this quote by Tolstoy (1897) in Singh and Ernst’s book “Trick or Treatment”.  I’ll let you decide for yourself  if it has any relevance to karate.

I know that most men, including those at ease with problems of the greatest complexity, can seldom accept the simplest and most obvious truth if it be such as would oblige them to admit the falsity of conclusions which they have proudly taught to others, and which they have woven, thread by thread, into the fabrics of their life.