最好的肥料是将农民的知识与自然的智慧相结合。
人类思维是一个复杂的系统,理解它需要多学科的方法。
愛とは、相手のすべてを受け入れることだ。
We teach a subject not to produce little living libraries on that subject, but rather to get a student to think mathematically for himself.