Refrigerator
While the ancient villager distributed the surplus to poor people and animals, the modern housewife preserves food in the refrigerator.
Practice
Intellectual understanding or theory is the starting point.
But it is useless, unless translated into practice, leading to the realization that the theory vaguely suggests.
Half-knowledge
Half-knowledge is like jumping half the width of an abyss.
Fortress
What is needed is virtue as a fortress - the key of the fortress is in your keeping.
The key of the prison-house is in another's.
Action
When the house is on fire, the first requirement is not a fruitless research into its cause, but to put it out.