All consider themselves, respectively, the only guardians of the truth, and that every other religion is composed of errors. They themselves are right, all others are wrong! The Jews believe that they are the only possessors of the truth and condemn all other religions. The Christians affirm that their religion is the only true one, that all others are false. Likewise the Buddhists and Muhammadans; all limit themselves. If all condemn one another, where shall we search for truth?

‘Abdu’l-Bahá, Paris Talks, p. 135

All religions teach that we should love one another; that we should seek out our own shortcomings before we presume to condemn the faults of others, that we must not consider ourselves superior to our neighbours! We must be careful not to exalt ourselves lest we be humiliated.

‘Abdu’l-Bahá, Paris Talks, p. 147

We must bestow commendation upon all people, thus removing the discord and hatred which have caused alienation amongst men. Otherwise the conditions of the past will continue, praising ourselves and condemning others; religious wars will have no end and religious prejudice, the prime cause of this havoc and tribulation, will increase. This must be abandoned, and the way to do it is to investigate the reality which underlies all the religions. This underlying reality is the love of humanity. For God is one and humanity is one, and the only creed of the prophets is love and unity.

‘Abdu’l-Bahá, Foundations of World Unity, p. 99