"These Covenant-breakers profess to accept the teachings of Bahá'u'lláh but they turn away from the Centre of the Cause--in the day of the Centre of the Covenant, 'Abdu'l-Bahá, and in our day, the Guardian--and thereby they deny what they profess to accept." (Page 251 of 1957 edition -- Emphasis added.)
AFTER Shoghi Effendi's passing:
"These Covenant-breakers profess to accept the teachings of Bahá'u'lláh but they turn away from the central authority in the Cause [i.e., an authority outside the Guardianship] to which all must turn and thereby they deny what they profess to accept." (Page 252 of 1975 edition --Emphasis added.)