困难
All things excellent are as difficult as they are rare.
In bad times， which are coming soon， it is better to die than to live.
The desires， and other passions of man， in themselves， are in his own power； his real difficulties are， to know when they are to be controlled， and when not.
To do great things is difficult，but to command great things is more difficult.
Thought is the most difficult task, which is why so few engage in it.
