The secret of change is to focus all of your energy, not on fighting the old, but on building the new.

"In observational studies, we often have to rely on assumptions that are not directly testable."

I was not born blind, I became blind at the age of 12. So I have seen the world and I know what things look like. When I sing about love and pain, joy and sadness, I know what I'm singing about.

就好像让人伏在剑刃上,而期望他能长寿一样。