Structure Part 1 (1-24 )How the subject of thinking was first brought up to the author and his understanding of the nature of “grade-three thinking” Part 2(25-29):The author's analysis of the nature of“grade-two thinking” Part 3(30-35):The author's understanding of the“grade-one thinking” and his desire for it Part 1 (1—24 ) : Part 2 (25—29) : Part 3 (30—35) : Structure How the subject of thinking was first brought up to the author and his understanding of the nature of “grade-three thinking” The author’s analysis of the nature of “grade-two thinking” The end of Structure. The author’s understanding of the “grade-one thinking” and his desire for it