数学是理性的音乐。

Faith is taking the first step even when you don't see the whole staircase.

When angry, count ten before you speak; if very angry, a hundred.

实际发展水平与潜在发展水平之间的距离，前者由独立解决问题决定，后者由在成人指导下或与更有能力的同伴合作解决问题决定。