According to Covenant theology God makes two basic covenants, or agreements, with humans. It concerns mortgages, rental agreements, licences, covenants, easements and the statutory systems for land registration. Real estate developers and agents developed restrictive covenants and deeds. Some courts refer to these as "restrictive covenants". Violations of negative covenants are rare compared to violations of affirmative covenants. Houston also directed the NAACP's campaign to end restrictive housing covenants. Future covenants between Israel and God would be conditional. In neither case is the revelation included in the Doctrine and Covenants. The focus of all biblical covenants is then on grace and faith. Taylor also oversaw the issuance of a new edition of the Doctrine and Covenants. Some items duplicated text that was already available in the Doctrine and Covenants. Today the binding UN covenants of the ICCPR and the ICESCR are now in force. Soloveitchik developed the idea that Jews have historically been linked together by two distinct covenants. It was modeled on the church covenants that Congregationalists used to form new congregations. It does not object to the covenants of the certificate.