Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.
不要担心你在数学上遇到的困难；我敢保证我遇到的困难比你还大得多。
I am always glad to think that my education was, for the most part, informal, and had its roots in the soil.
每一笔巨大的财富背后都隐藏着罪行。
释义：即使家庭贫困，也要保留读书的希望；即使生活富裕，也不能忘记劳动的艰辛。