I said, to the people of the Philippines whence I came, I shall return. Tonight, I repeat those words: I shall return!

Confidence isn't optimism or pessimism, and it's not a character attribute. It's the expectation of a positive outcome.

To love means to open ourselves to the negative as well as the positive - to grief, sorrow, and disappointment as well as to joy, fulfillment, and an intensity of consciousness we did not know was possible before.

数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。