When stocks are attractive, you buy them. Sure, they can go lower. I've bought stocks at $12 that went to $2, but then they later went to $30. You just don't know when you can catch the bottom.
The beauty of mathematics only shows itself to more patient followers.
成功不在于金钱或名声，而在于你对他人产生的影响。
The only way to do great work is to love what you do.
The goal of software engineering is to create systems that are reliable, efficient, and easy to understand and modify.