The goal of mathematics is to understand the universe in a deeper way.

拿一个物体。对它做点什么。再对它做点别的。

Keep all your things visible in a hotel room， not in drawers， and all gathered into one spot. That way you’ll never leave anything behind. If you need to have something like a charger off to the side， place a couple of other large items next to it， because you are less likely to leave 3 items behind than just one.

There is no love that’s so right as admiration-based love, and that love should include the instructive dead. Somehow, I got that idea and I lived with it all my life and it’s been very very useful to me.

每个人都对自己未做的好事负有罪责。