One might ask, "Then what about these ascetics who lived the life of a hermit in solitude, who did not eat proper food, who kept themselves away from all the comfort and beauty of life?" These are not for everyone to follow. At the same time it is a mistake to criticize them. Such people are the ones who make experiments of life by the sacrifice of all the joy and pleasure that the earth can give. By their solitude they experiment, just as a scientist shuts himself up in his laboratory for years and years; and these ascetics who left everything in the world also attained a certain knowledge which they give us. It is not a principle for everyone to follow, for spirituality does not depend upon such things.