The whole is different from the sum of its parts.
The world is full of obvious things which nobody by any chance ever observes.
The only real failure in life is not to be true to the best one knows.
不要靠馈赠去获得朋友，你必须奉献你诚挚的爱，学会怎样用正当的方法来赢得别人的心。
理论必须是美丽的。
The most dangerous strategy is to jump a chasm in two leaps.