Mastering others is strength, mastering yourself is true power. ~ Lao Tzu

In Chinese
知人者智,自知者明，胜人者有力,自胜者强

Some people think that to be strong is to never feel pain. In reality, the strongest people are the ones who feel it, understand it, and accept it.

You were given this life because you are strong enough to live it.

You never realize how strong you are until being strong is the only choice that you have.