"Now, the science of Hatha Yoga rests upon the 'suppression of breath,' or Pranayama, to which exercise our Masters are unanimously opposed. For what is Pranayama? Literally translated, it means the 'death of (vital) breath.' . . . Several impatient Chelas, whom we knew personally in India, went in for the practice of Hatha Yoga, notwithstanding our warnings. Of these, two developed consumption, one of whom died; others became almost idiotic; another committed suicide; and one developed into a regular Tantrika, a Black Magician, but his career, fortunately for himself, was cut short by death."
January 1, 1970
https://en.wikiquote.org/wiki/Masters_of_Wisdom_(Theosophy)