Principle 3:
The Foundation of all Religions is One
All the Prophets are the Temples of the Cause of God,
Who have appeared clothed in divers attire.
If thou wilt observe with discriminating eyes,
thou wilt behold them all abiding in the same tabernacle,
soaring in the same heaven,
seated upon the same throne,
uttering the same speech,
and proclaiming the same Faith
(Baha'u'llah, The Kitab-i-Iqan, p. 153)
There is one God;
mankind is one;
the foundations of religion are one.
Let us worship Him,
and give praise for all His great Prophets
and Messengers who have manifested
His brightness and glory.
( 'Abdu'l-Bahá , 'Abdu'l-Bahá in London, p. 19)