The term transmutation comes from alchemy. Alchemists pursued the philosopher’s stone, capable of chrysopoeia (the transformation of base metals into gold). Transmutation is a process by which the atoms of one element are changed into atoms of another element, thereby releasing a great amount of energy. In Hridaya Yoga, defining the terms transmutation and sublimation is a way to better understand the inner transformations that appear in the practice of brahmacharya (spiritual abstinence or continence) and in the Hatha Yoga practices in general. In the yogic context, these terms have a slightly different connotation than those used in alchemy, psychology, or physics. When we refer to phenomena based on inner physical changes, we refer to “transmutation.” When we refer to energetic changes that are not caused by a physical, material transformation, we refer to “sublimation.”