Obligatory Prayer and Fasting

Through worship man becometh spiritual, his heart is attracted, and his soul and inner being attain such tenderness and exhilaration that the Obligatory Prayer instilleth new life in him. This is why in the Tablet of Visitation it hath been revealed: "I beseech God, by Thee and by them whose faces have been illumined with the splendours of the light of Thy countenance, and who, for love of Thee, have observed all whereunto they were bidden." It is clear then that love of the beauty of the All-Merciful impelleth one to the worship of Almighty God. 
(‘Abdu’l-Baha, compilation ‘The Importance of Obligatory Prayer and Fasting’, compiled by Research Department of the Universal House of Justice; published in The American Baha'i, September 2000)