德之不修,学之不讲,闻义不能徙,不善不能改,是吾忧也。
不修养品德,不讲习学问,听到正义不能追随,有缺点不能改正,这些都是我所忧虑的。
To be a good mathematician, you need to have both intuition and rigor.
Reading furnishes the mind only with materials of knowledge; it is thinking that makes what we read ours.
人必须内心怀有混沌,才能诞生出舞蹈的星辰。