The future of the world lies in the cities.

We are to remember that we are not to take anything with us out of this world, and that it is how we have conducted ourselves here that will matter in the end.

The secret of change is to focus all your energy not on fighting the old, but on building the new.

The best way to forget something is to replace it with something better.

有时化学中最简单的解决方案是最优雅和最强大的。