On Revolutionary Medicine Speech by Che Guevara to the Cuban Militia on August 19, 1960. "Because of the circumstances in which I traveled, first as a student and later as a doctor, I came into close contact with poverty, hunger and disease; with the inability to treat a child because of lack of money; with the stupefaction provoked by the continual hunger and punishment, to the point that a father can accept the loss of a son as an unimportant accident, as occurs often in the downtrodden classes of our American homeland. And I began to realize at that time that there were things that were almost as important to me as becoming a famous or making a significant contribution to medical science: I wanted to help those people."
Fødselsdatoen vist på hans fødselsattest var 14. juni 1928, selvom en tertiær kilde, (Julia Constenla, citeret af Jon Lee Anderson), fastholder at han blev født 14. maj samme år. Constenla hævder at hun fik fortalt af en uidentificeret astrolog at hans Guevaras, Celia de la Serna, allerede var gravid da hun og Ernesto Guevara Lynch blev gift og at datoen på deres søns fødselsattest blev forfalsket for at undgå en skandale. ([Anderson 1997, pp. 3, 769.)
