法律规范的有效性不取决于其内容，而取决于其产生的方式。

解析：菩提比喻智慧，明镜比喻清净心。本来清净，又哪里会染上什么尘埃？

Quantum cryptography doesn't rely on the difficulty of mathematical problems, but on the fundamental laws of physics.

儒家的精髓在于美德的培养和仁爱的实践。