Every mathematical problem has a solution; the challenge is finding it.
每个数学问题都有解答;挑战在于找到它。
智力不仅仅是推理的能力;它还包括在记忆中寻找相关材料并在需要时调动注意力的能力。
"The only limit to our realization of tomorrow is our doubts of today."
"The best children's books are the ones that make children think."