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 greatest battles are not fought with weapons, but with ideas.

A well-educated black has a tremendous advantage over a well-educated white in terms of the job market. I think sometimes a black may think they don't have an advantage or this and that... I've said on one occasion, even about myself, if I were starting off today, I would love to be a well-educated black, because I believe they do have an actual advantage.

最有趣的艺术来自矛盾。