Deleting recently deleted messages on iPhone 14 is a straightforward process. Firstly, navigate to the Messages application and select the "Recently Deleted" folder. Once inside, tap "Edit" in the upper right-hand corner. You should now see a red circle with a minus sign next to each message. Tap each circle next to the messages you wish to delete, and then tap "Delete" in the lower left-hand corner of the screen. Lastly, confirm your selection by tapping "Delete Message" in the pop-up window. The messages will now be permanently deleted from your iPhone 14 and cannot be recovered.