I am certain of nothing but the holiness of the heart's affections, and the truth of imagination.
数学是一门活生生的学科,不断演变和发展。
及时采拮你的花蕾,旧时光一去不回。今天尚在微笑的花朵,明日便在风中枯萎。
The first step towards philosophy is incredulity.