"The world is full of obvious things which nobody by any chance ever observes."

The most common way people give up their power is by thinking they don't have any.

Every breakthrough is at first laughable and ridiculous. In fact if it did not start out laughable and ridiculous， it is not a breakthrough.

求学的人必须先立下志向。志向确立后，学问就可以按部就班地下功夫。