The real challenge in computer science is not to write programs, but to understand the nature of computation.
有志之士珍惜每一年的光阴;贤德之人,珍惜每一天的光阴;而圣人则会珍惜每一寸的光阴。
生活就像一面镜子,你朝它皱眉,它也朝你皱眉;你微笑,它也报以微笑。