Deprived of meaningful work, men and women lose their reason for existence; they go stark, raving mad.
If one wanted to crush and destroy a man entirely, to mete out to him the most terrible punishment, all one would have to do would be to make him do work that was completely and utterly devoid of usefulness and meaning.
To crush, to annihilate a man utterly, to inflict on him the most terrible of punishments so that the most ferocious murderer would shudder at it and dread it beforehand, one need only give him work of an absolutely, completely useless and irrational character.