When making something， always get a few extras — extra material， extra parts， extra space， extra finishes. The extras serve as backups for mistakes， reduce stress， and fill your inventory for the future. They are the cheapest insurance.

如果自己都不正直，就无法要求他人；忘记亲人的人也无法忠诚于君主！这修身齐家的道理，太深刻了！并且只有先做好自己，才能影响周围的人！

Even if I knew that tomorrow the world would go to pieces, I would still plant my apple tree.

The more you can increase the fear of failure, the more you can motivate people to avoid it.

数学不是一项观赏性运动。