"And if ye say that He is in need of a guardian for His cause, verily this is an injustice"

The religion basically started with what we would now call 'covenant-breaking', as Baha'u'llah rebelled against Azal who was the legitimate head of the faith at that time. In his defence, Baha'u'llah wrote:

"These are the days of the Manifestation and God is manifest like unto the sun in the midst of heaven, and in the courtyard of His sanctity, nothing of the vanities of the world existeth which would necessitate a guardian to divide it. And if ye say that He is in need of a guardian for His cause, verily this is an injustice on your part with regard to God, the Protector, the Eternal. For the cause is, and shall be going round Himself and shall never separate from Him. Beware lest ye create for God a minister, an equal, an adversary, a like, a guardian, a companion, or a match." (see "A Lost History of the Baha'i Faith")

Years later Muhammad Ali would use the same quote as defence against 'the Master' and 'the Guardian'.