At the same time man has no regard for his spirit, which is the most delicate machinery of all. Once it goes wrong it may never get right again; and it is very easy for it to go wrong, while it is most difficult to repair it. For other machinery we can get spare parts, but not for this machinery, when once it is broken, when once something of it is lost. And when one thinks of all the illnesses and disagreeable experiences of the outer life, what about the spirit? When once the spirit is disturbed then the whole universe is disturbed for that person.