The ultimate test of any economic theory is whether it improves real-world decisions.

To one who has faith, no explanation is necessary. To one without faith, no explanation is possible.

译文：贫穷到没有办法时，只要节俭还可以度日。天资愚钝也没有什么大不了，只要勤奋，也能弥补它的不足。赏析：自身条件不行，就要时刻警醒自己，发愤图强。如果破罐子破摔，躺平摆烂，事情就会变得更加糟糕。