A typical statement Robert Gordon Wasson heard when asking Central American Indians about their sacred mushrooms (teonanacatl, "God's flesh"). He was the first Westerner to partake of psilocybin mushrooms in the summer of 1955, following a long fascination with mushrooms of all kinds. This is from the article from Life magazine. The curandera, or shaman, is listed as Eva Mendes, a pseudonym Wasson gave to protect the name of the actual woman, Maria Sabina.
The dose described for Maria was 13 pairs of fresh mushrooms, well into "heroic dose" territory, although I think there is a certain logic in going high, particularly if you are experienced. Blasting completely past psychological issues and leaving them in the dust does make a certain amount of sense. The Westerners were given 6 pairs of fresh shrooms, a healthy amount perhaps comparable to an eighth of dried mushrooms, around 3.5 grams.