1. What can people do if there are no obstacles in their life journey? Bismarck

2, nothing is difficult in the world, nothing is impossible to a willing mind. Nothing in the world is difficult for one who sets his mind to it. Yuan Mu

3, all pain can destroy people, but people who suffer can also eliminate pain! byron

First of all, I ask you to believe in science, rationality, yourself and yourself. -Hegel

Dear friends, all theories are gray, but the precious tree of life is evergreen. -Goethe