The true value of a mathematical theory lies in its ability to connect seemingly unrelated ideas.
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。
"The truth is rarely pure and never simple."
"I don't want to be compared to anyone. I want to make my own history."