No one is altogether to be blamed for the defects of his nature; but he is blameworthy if he takes no pains to correct them.  
La palabra es el arma más poderosa que tiene el ser humano.
“在科学中,重要的不是获得新的事实,而是发现思考它们的新方法。”
"The world is full of obvious things which nobody by any chance ever observes."