Each human being should “investigate the reality underlying the … Word of God” revealed by Founders of various world religions, to see their fundamental unity

Inasmuch as human interpretations and blind imitations differ widely, religious strife and disagreement have arisen among mankind, the light of true religion has been extinguished and the unity of the world of humanity destroyed. The prophets of God voiced the spirit of unity and agreement. They have been the founders of divine reality. Therefore if the nations of the world forsake imitations and investigate the reality underlying the revealed Word of God they will agree and become reconciled. For reality is one and not multiple. (Abdu'l-Baha, Baha'i World Faith, p. 226)