Just like India's Upanishadic teaching tradition unfolded the Knowledge of the true identity of the individual, the universe and God, the Náhuatl Tlamatinime (spiritual teachers) were the "phylosphers", as Sahagun called them, who, abiding in Spiritual wisdom, were able to guide their students to discover the nature of their True Self. Don Miguel Leoón-Portilla is the ideal commentator because, after introducing his readers to the Tlamatinime's recorded words, showing a deep personal insight of the Náhuatl language, he accurately and methodically expounds, word by word and verse by verse, in the content of their spiritual wisdom. My opinion is that he could be considered the Adi Shankaracharya (the Commentary Master of the Tradional Vedanta texts of India) of the Americas.