If two individuals dispute . . . both are wrong.

‘Abdu’l-Bahá, Divine Philosophy, p. 84

In brief, O ye believers of God! The text of the divine Book is this: If two souls quarrel and contend about a question of the divine questions, differing and disputing, both are wrong. The wisdom of this incontrovertible law of God is this: That between two souls from amongst the believers of God, no contention and dispute may arise; that they may speak with each other with infinite amity and love. Should there appear the least trace of controversy, they must remain silent, and both parties must continue their discussions no longer, but ask the reality of the question from the Interpreter. This is the irrefutable command!

‘Abdu’l-Bahá, Tablets of the Divine Plan, p. 56

As long as the friends quarrel amongst themselves their efforts will not be blessed for they are disobeying God.

Shoghi Effendi, The Compilation of Compilations vol II, p. 21

During the days of Bahá’u’lláh some of the prominent teachers of the Cause in Persia were divided as to the station of Bahá’u’lláh and at last wrote to Him for arbitration. In answer Bahá’u’lláh said that if they were united both sides were right and if they were divided both were wrong.

Shoghi Effendi, Lights of Guidance, p. 405

The more the friends argue back and forth and maintain, each side, that their point of view is the right one, the worse the whole situation becomes.

Shoghi Effendi, Directives of the Guardian, pp. 17-18

When criticism and harsh words arise within a Bahá’í community there is no remedy except to put the past behind one and persuade all concerned to turn over a new leaf, and, for the sake of God and His Faith, refrain from mentioning the subjects which have led to misunderstanding and inharmony.

Shoghi Effendi, Directives of the Guardian, pp. 17-18

For Bahá’ís to go further than this, by engaging in acrimonious debate, much less by reflecting on the character of others, would be to cross the line that separates legitimate defence of the Faith from contention.

The Universal House of Justice, 1999 Nov 22, Attacks on the Faith in Internet Discussions, p. 2