June 21

From the days of Adam until today, the religions of God have been made manifest, one following the other, and each one of them fulfilled its due function, revived mankind, and provided education and enlightenment. They freed the people from the darkness of the world of nature and ushered them into the brightness of the Kingdom. As each succeeding Faith and Law became revealed it remained for some centuries a richly fruitful tree and to it was committed the happiness of humankind. However, as the centuries rolled by, it aged, it flourished no more and put forth no fruit, wherefore was it then made young again.

The religion of God is one religion, but it must ever be renewed… 
(‘Abdu’l-Baha, ‘Selections from the Writings of ‘Abdu’l-Baha’)