Religion and science are the two wings upon which man's intelligence can soar into the heights, with which the human soul can progress.  It is not possible to fly with one wing alone!  Should a man try to fly with the wing of religion alone he would quickly fall into the quagmire of superstition, whilst on the other hand, with the wing of science alone he would also make no progress, but fall into the despairing slough of materialism.

"Paris Talks," p. 143

All beings, whether large or small, were created perfect and complete from the first, but their perfections appear in them by degrees.  The organization of God is one; the evolution of existence is one; the divine system is one.  Whether they be small or great beings, all are subject to one law and system.

"Some Answered Questions," p. 198

The greatest bestowal in the world of existence is a tranquil heart, and it is impossible for man to obtain a tranquil heart save through the good pleasure of the Lord.  That is, a man may so adorn the temple of his being with lofty attributes and philanthropic deeds as to be pleasing at the Threshold of the Almighty.  This is the only Path and there is no other Path.  My point is this:  Let all your thoughts, your ideals, your aims and purposes revolve day and night around one common object – that is, to live in accord with the good pleasure of the Lord.  Then all the doors of felicity will be opened before your faces, you will become successful in all your undertakings, and you will be confirmed in all your accomplishments.  The basic principle is the good pleasure of the Lord:  and the good pleasure of God is obtained through a tranquil heart, and the tranquility of the heart is only gained by living in accord with the Divine Teachings and Exhortations.

"Star of the West, vol.16," p.401

Religions are many, but the reality of religion is one.  The days are many, but the sun is one.  The fountains are many, but the fountainhead is one.  The branches are many, but the tree is one.   The foundation of the divine religions is reality; were there no reality, there would be no religions.  Abraham heralded reality.  Moses promulgated reality.  Christ established reality.  Muhammad was the Messenger of reality.  The Báb was the door of reality.  Bahá'u'lláh was the splendor of reality.  Reality is one; it does not admit multiplicity or division.

"The Promulgation of Universal Peace," p.126

Praise be to God, in this day the light of the Word of God has shone forth upon all regions, and from all sects, communities, nations, tribes, peoples, religions and denominations, souls have gathered under the shadow of the Word of Oneness and have in the most intimate fellowship united and harmonized!

Excerpt from letter to the Central Organization for a Durable Peace
The Hague, 17 December 1919