Never let your sense of morals prevent you from doing what is right.
大切なのは、何を手に入れるかではなく、何を失わないかだ。
The moment you stop chasing money, money starts chasing you.
No matter how good you get you can always get better, and that's the exciting part.
The Erdős discrepancy problem fascinated me because it was so simple to state yet so deep in its implications.