“We have implied that asceticism, when considered as a whole, can assume various meanings at successive spiritual levels. Simply defined, that is to say as “training” or discipline, an ascesis aims at placing all the energies of the human being under the control of a central principle. In this respect we can, properly speaking, talk of a technique that has, in common with that of modern scientific achievements, the characteristics of objectivity and impersonality. Thus an eye, trained to distinguish the accessory from the essential, can easily recognize a “constant” beyond the multiple variety of ascetic forms adopted by this or that tradition.”