A noble person's mind is pure, but their thoughts might be contrary to the world's views. One should not express such thoughts among the common people, lest it causes immense trouble.

This couplet offers wise advice on how to navigate the world. It suggests that while a good-hearted person may have pure intentions and unique thoughts that might differ from common beliefs, it's often best to keep such differing views to yourself when among a large crowd. Expressing unconventional ideas openly can sometimes lead to misunderstandings, conflicts, or unnecessary problems. So, even with a pure heart, a wise person chooses their words and audience carefully to avoid needless trouble. It's about thoughtful discretion and preserving peace.