What does the phrase words are but wind mean?

"A man may break a word with you, sir; and words are but wind." -William Shakespeare, The Comedy of Errors

Words can move objects in their path.

Words are not firm or dependable.

Words may arise strongly and suddenly.

Words can be heard but not seen.

What does the phrase words are but wind mean? A man may break a word with you, sir; and words are but wind. -William Shakespeare, The Comedy of Errors Words can class=