The discovery of DMT in the human body stimulated much less fanfare than did that of endorphins. Anti-psychedelic-drug sentiment sweeping the USA at the time actually turned researchers against studying endogenous DMT. The discoverers of endorphins, in contrast, won Nobel Prizes.
Man is endogenous, and education is his unfolding. The aid we have from others is mechanical, compared with the discoveries of nature in us. What is thus learned is delightful in the doing, and the effect remains.