"When observing carefully it appears that the activity of the salivary gland is always excited by some external phenomenon, i.e. that it is induced by external stimuli like the usual physiological salivary reflex…The difference between the two reflexes is firstly that our old physiological reflex is constant, unconditioned, while the new reflex continually fluctuates and, hence, is conditioned."
http://nobelprize.org/nobel_prizes/medicine/laureates/1904/pavlov-lecture.html
"With the progress of our research, I am deeply convinced that along this path will be found the final triumph of the human mind over its uttermost and supreme problem-the knowledge of the mechanism and the laws of human nature."
http://select.nytimes.com/gst/abstract.html?res=FB0911F63E55127A93C2AA178DD85F4D8285F9&scp=1&sq=a%20man%20who%20speaks%20his%20mind%20in%20russia&st=cse
"Only science and the most sincere approach to it by the aid of the omnipotent scientific method will deliver man from his present gloom and purge him from his contemporary shame in the sphere of human relations."
http://select.nytimes.com/gst/abstract.html?res=FB0911F63E55127A93C2AA178DD85F4D8285F9&scp=1&sq=a%20man%20who%20speaks%20his%20mind%20in%20russia&st=cse
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