"Jews, Zoroastrians, Christians, Muslims and others have attained to a superlative state of love and agreement through Bahá’u’lláh."

"The first teaching is that man should investigate reality, for reality is contrary to dogmatic interpretations and imitations of ancestral forms of belief to which all nations and peoples adhere so tenaciously. These blind imitations are contrary to the fundamental basis of the divine religions, for the divine religions in their central and essential teaching are based upon unity, love and peace, whereas these variations and imitations have ever been productive of warfare, sedition and strife. Therefore, all souls should consider it incumbent upon them to investigate reality. Reality is one; and when found, it will unify all mankind. Reality is the love of God. Reality is the knowledge of God. Reality is justice. Reality is the oneness or solidarity of mankind. Reality is international peace. Reality is the knowledge of verities. Reality unifies humanity.

In brief, His theme was that reality underlies all the great religious systems of the world. He summoned the nations and peoples of the world to it. Hostile nations because of their acceptance of the reality of His words became unified. Strife, discord and contention among them passed away; they attained a station of utmost love. At present in Asia those who have accepted His teachings and followed His example, although formerly most hostile and bitter toward each other, now associate in brotherhood and fellowship. The strife and warfare of past times have ceased among them. Jews, Zoroastrians, Christians, Muslims and others have attained to a superlative state of love and agreement through Bahá’u’lláh. They now consort together as one family. They have investigated reality. Reality does not accept multiplicity, nor is it subject to divisibility. These irreconcilable peoples have become unified and agreed."

`Abdu'l-Bahá, The Promulgation of Universal Peace , pp. 372-373

25 October 1912
(excerpt from) Talk at Hotel Sacramento 
Sacramento, California

`Abdu'l-Bahá