November 26

...the power of the Covenant will protect the Cause of Bahá'u'lláh from the doubts of the people of error. It is the fortified fortress of the Cause of God and the firm pillar of the religion of God. 

- ‘Abdu’l-Baha  (‘Tablets of the Divine Plan Revealed by 'Abdu'l-Bahá to the North American Bahá'ís’; The Compilation of Compilations, vol. I, The Covenant)