What does this sentence mean, master?

First of all, I think you are very careful, but I think you are too careful to care about the meaning of every conversation in life. In fact, it is often that the speaker is unintentional and the listener is intentional, so don't care too much.

If you have to explain, I think your teacher thinks you can pass the exam, so you don't have to be so tired. This is good news for him. He can finish his work early.