With vigilant care man is to expel every element that vexes or irritates or chafes just as the husbandman expels nettles and poison ivy from fruitful gardens.
For nothing is so easily wrecked as the soul.

As mechanisms go up toward complexity, delicacy increases.

The fragile vase is ruined by a single tap.

A chance blow destroys the statue.

A bit of sand ruins the delicate mechanism.