数学不仅仅是关于数字、方程、计算或算法:它是关于理解的。
A philosophical problem has the form: 'I don't know my way about.'
中年之后,只有已为告别人生做好准备的人,才能继续在生活中朝气蓬勃。
Theoretically there is a perfect possibility of happiness: believing in the indestructible element within oneself, and not striving towards it.