传统方法蕴含智慧，但可持续发展要求我们在必要时超越它们。
The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.
幸福婚姻和痛苦婚姻的区别...在于大约十个持续的愚蠢或善良行为，取决于方向。
To understand recursion, one must first understand recursion.
Life is not about waiting for the storm to pass, but learning to dance in the rain.