Does First Things allow posting the whole text? Many sources don’t because they do all the work and then they don’t get the traffic to their site. I don’t know the First Things policy so if you’ve already checked, great. A otherwise I can email them.
Yes. At one time, FR published a list of sites that had to be excerpted. By now, that list is probably out of date. To test any site,, simply type a word in the box, and do preview. If it is a site that needs to be excerpted, it will generate a message indicating so. Otherwise, you may post the entire text.