困难是一个严厉的导师。

The trouble is that a strict teacher.

只有在苦难中，才能认识自我。

Only in the suffering, can know his own self.

忍耐是对一切困难的最好治疗。

Patience is the best therapy for all difficulties.

困难坎坷是人们的生活教科书。

Difficult circumstances serve as a textbook of life for people.

苦难显才华，好运隐天资。

Adversity reveals genius； fortune conceals it. （Horace, ancient Roman poet）

这些格言都表达了生活艰难的主题，并提供了不同的视角和启示。希望这些格言能对你有所帮助。