不要等待完美的时刻，抓住这一刻并让它变得完美。

"Sometimes I think that the only thing that connects us to the past is the present. Without the present, the past would be lost forever."

The present state of the system of nature is evidently a consequence of what it was in the preceding moment, and if we conceive of an intelligence which at a given instant comprehends all the relations of the entities of this universe, it could state the respective positions, motions, and general effects of all these entities at any time in the past or future.

计算理论不仅仅是关于解决问题，还涉及理解可计算性的极限。