While I was reading a book, the following sentence caught my eye.
Sincerity and courtesy are of desirable character traits.
I saw this kind of sentence before, but never fully understood why the preposition 'of' is used. If I remove the preposition 'of', the sentence become..
Sincerity and courtesy are desirable character traits.
To me, both sentences convey the same meaning. I have also seen sentences like..
The man is of great importance.
So do we really need a preposition in these scenarios? If yes, then why and how to use the preposition 'of' properly with 'is/are'?