You know I don't say anything like that often." "I know it," nodded Frank, "and that's why it sounded all the worse.

I don't know that I ever heard you use such a word before." Harry did not resent Frank's reproof, for he knew Frank was right, and he was ashamed.
Every young man who stoops to vulgarity should be ashamed.

Profanity is coarse and degrading; vulgarity is positively low and filthy.

The youth who is careful to keep his clothes and his body clean should be careful to keep his mouth clean.

Let nothing go into it or come out of it that is in any way lowering.
Did you ever hear a loafer on a corner using profane and obscene language?
I'll warrant most of you have, and I'll warrant that you were thoroughly disgusted.