"Blessed are ye, when men shall revile you, and persecute you, and shall say all manner of evil against you falsely, for my sake."
Castle last week said Folau's "personal religious beliefs" did not represent the view of RA or NSW Rugby.
"We understand that Israel's comment has upset a number of people and we will discuss the matter with him as soon as possible," Castle said in a statement.
It's unlikely either side will easily give up their position but RA and the Waratahs will hope Folau can be persuaded not to continue expressing such a controversial stance publicly.
Off contract at the end of the year, three-times John Eales Medallist Folau has seemingly contravened RA's inclusion policy.
"There is no place for homophobia or any form of discrimination in our game and our actions and words both on and off the field must reflect this," the policy states.
- AAP