Foundations of World Unity

...But the wise souls who are aware of the essential relationships emanating from the realities of things consider that one single matter cannot, by itself, influence the human reality as it ought and should, for until the minds of men become united, no important matter can be accomplished. At present Universal Peace is a matter of great importance, but unity of conscience is essential, so that the foundation of this matter may become secure, its establishment firm and its edifice strong.
Among Bahá’u’lláh's teachings were the declaration of Universal Peace, the independent investigation of reality, the oneness of the world of humanity, religion must be the cause of fellowship and love, religious, racial, political, economic and patriotic prejudices destroy the edifice of humanity, the equality of women and men, ...

‘Abdu’l-Bahá: Foundations of World Unity