实现明天的唯一限制将是我们今天的疑虑。
The only limit to our realization of tomorrow will be our doubts of today.
真相很少是纯粹的，也从不简单。
最危险的不是失败，而是自满。
In computational complexity, we are not just dealing with the limits of what we can compute, but also with the limits of what we can prove.