I want peace of mind.

I'd appreciate it if someone would answer my question. Thanks in advance.

Concerning the following 2 sentences ------

A: I wonder if he really knows the importance of training every day.

B: People in the country do need freedom of speech.

C: I want peace of mind.

I think "the importance of training" in A is created by transforming the sentence: "Training is important." The" is necessary because the fact that "Training is important" expresses a specific importance.

But "freedom of speech" in B has no such internal structure or process of transformation as A has. "Freedom of speech" is just a set phrase.

Are these ideas of mine both true?

Does "peace of mind" in C belong to type B?