And I think that before anything else we ought to touch on their untiring perseverance and humility and subjection, -- how it lasts for so long, and by what system it is formed, through which they remain in the monasteries till they are bent double with old age; for it is so great that we cannot recollect any one who joined our monasteries keeping it up unbroken even for a year: so that when we have seen the beginning of their renunciation of the world, we shall understand how it came about that, starting from such a commencement, they reached such a height of perfection.