I like this quote from Wang Xiaobo:

"I came to this world not to reproduce, but to see how flowers bloom, how water flows, how the sun rises, and when the sun sets. I live in this world just to understand some truths and encounter some interesting things. Life is an accident, and I look for cause and effect in it."

And Nietzsche:

"You have to figure out the script of your life. You are not the sequel to your parents, not the prequel to your children, and not the epilogue to your friends. You might as well be bolder in life, because you will lose it in the end. The most difficult stage in life is not that no one understands you, but that you don't understand yourself."