if you go up high, then use your own leg! do not let yourselves carried aloft .do not seat yourselves on other peoples back and head .——F.W.Nietzasche

activity is the only road to knowledge——george bernard shaw

only those who have the patience to do simple things perfectly ever acquire the skill to do difficult things easily.

when an end is lawful and obligatory，the indispensable means to it are also lawful and obligatory

nothing is imposible

the supreme happiness of life is the conviction that we are loved.

if you want to understand today. you have to search yesterday