你相信有人心这回事吗？我不仅仅是指那个器官，当然喽。我说的是这个词的文学意义。人心。你相信有这样东西吗？某种让我们每个人成为独特个体的东西？
The study of mathematics is a constant dialogue between the concrete and the abstract.
The mind is not a passive recipient of sensory information but an active participant in the process of perception.
And I urge you to please notice when you are happy, and exclaim or murmur or think at some point, 'If this isn't nice, I don't know what is.'
The beauty of a mathematical proof is in its elegance and the way it reveals the underlying truth in a clear and concise manner.