For a period of thirty years, he opposed the Centre of the Covenant and, to bring down His structure in ruins, did everything that lay in his power. This in spite of the fact that the divine Beauty had made His Covenant so strong, and appointed its Centre so explicitly, in writing, unmistakably, that He had left no room for any questions or doubts. In the Most Holy Book of Aqdas, which in this most excellent of all ages is the Mother Book, and embraces all, and again in the Kitáb-i-‘Ahdí,(150) the last revealed Tablet by the Tongue of knowledge and wisdom, which contains the final wishes of God—the people of Bahá are directed with perfect clarity to turn their faces toward Him Whom God has purposed, and He is designated as the Interpreter of the Book, the Resolver of all complex and difficult questions, and the Centre of the Faith. Therein as well are the other Branches, the Afnán and the rest of the believers bidden to direct themselves unto that One so that all might face one and the same Centre, and all be bound thereto. Thus would the basic foundation of God’s Cause, which is unity, remain unassailable. Thus the root of heresy and rebellion would wither away, and just as in the days when He Who is the Truth was made manifest, so too in the day of His Covenant the light of unity would pervade all things, and put to flight the murk of disbelief and dualism and rebellion and opposition—and thus the tree of His holy Cause would grow and flourish, and the rich fruits borne by the holy Teachings would satisfy all needs and be sweet in the mouth of all mankind. This fact of there being only one Centre and of turning unto a single holy Being is, in the Kingdom of His Cause, as the shaft or spindle of a millstone, and all the other laws and ordinances must needs revolve around this one. In the temple of God’s religion the Centre of the Cause can be likened to the heart, for upon it depends the life of the human body as one entity, as well as the relationships of its organs and their essential growth and vitality. In human society the Centre of the Cause can be compared to the sun, whose magnetic force controls the movements and orbits of the planets. The Centre of the Cause is also like the spine of a book, for by it the pages are all banded together into one book, and without the spine the papers would become loose and scattered.