Update: Many thanks to Alexa Tulk, Public Services Supervisor of The Hanna Holborn Gray Special Collections Research Center of University of Chicago Library. She helped me locate the source of the above quote, and also shared relevant material with me which was included in the pre-publishing research of its source. The source of the quote is Adler’s ”The Time of Our Lives” originally published through Holt, Rinehart and Winston in 1970 (my first edition copy was reprinted in 2005 through Fordham, and reproduces the exact section I quote in chapter 10).
(I would edit this into the original post if I had that power. I would also update the title of the thread to include Adler‘s last name.)