数学的研究就像空气或重力——它无处不在，即使你看不到它。
The study of mathematics is like air or gravity – it’s everywhere, even if you don’t see it.
By nature, all things are common.
"Books are the keys to the universe."
Efficiency is highly overrated； Goofing off is highly underrated. Regularly scheduled sabbaths， sabbaticals， vacations， breaks， aimless walks and time off are essential for top performance of any kind. The best work ethic requires a good rest ethic.
