March 2

Ordinances which are obligatory and decrees that are binding are those that have issued forth from the Supreme Pen or are issued by a decision of the Universal House of Justice. For we are the commanded, not the commander. We are the ones upon whom duties are imposed, not the ones who impose duties. This is the reality of the law of God and the foundation of the religion of God. As for devotions and invocations, whoever wisheth may, after the Obligatory Prayers, recite other supplications of the Blessed Perfection. 
(‘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)