You may not be able to alter reality, but you can alter your attitude towards it, and this, paradoxically, alters reality.

不存在所谓的质量问题。只有问题，而这些问题的解决方案可能涉及质量考虑。

Principles is another name for prejudice.

解释：看见美丽的容貌就心悦，是人之常情。