在数学中，提出问题的艺术必须比解决问题更有价值。
In mathematics, the art of proposing a question must be held of higher value than solving it.
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。
The past does not belong to us; we belong to it.
The act of painting is an act of alchemy.
你把桃子投于我，我把李子回赠与你。桃子和李子价值相当，表明我本人是知恩图报的，也有互相赠送，礼尚往来的意思。