Nature traps people in darkness and forces them to always yearn for light.

——Goethe

Danger is the touchstone of life.

——Shirokov

Only in suffering can one know oneself.

——Hildy

Adversity and hardship are the highest schools for tempering one’s character.

——Liang Qichao

If you don’t understand pain, you are not a good man.

——Hugo

Difficulty is a harsh mentor.

——Baker

Difficulties arise from the effort to overcome them.

——Smiles

Sorrow inspires genius.

——Horace

Not everything that is helpful to you is within easy reach.

——Ferguson

The most difficult time is when success is not far away.

——Napoleon

If there are no obstacles in the way of life, what else is there for people to do.

——Bismarck

Everything tastes bitter before it matures.

——Cyrus