Mankind's twin duties

The first duty prescribed by God for His servants is the recognition of Him Who is the Dayspring of His Revelation and the Fountain of His laws, Who representeth the Godhead in both the Kingdom of His Cause and the world of creation. Whoso achieveth this duty hath attained unto all good; and whoso is deprived thereof hath gone astray, though he be the author of every righteous deed. It behoveth every one who reacheth this most sublime station, this summit of transcendent glory, to observe every ordinance of Him Who is the Desire of the world. These twin duties are inseparable. Neither is acceptable without the other. Thus hath it been decreed by Him Who is the Source of Divine inspiration.

They whom God hath endued with insight will readily recognize that the precepts laid down by God constitute the highest means for the maintenance of order in the world and the security of its peoples. He that turneth away from them is accounted among the abject and foolish. We, verily, have commanded you to refuse the dictates of your evil passions and corrupt desires, and not to transgress the bounds which the Pen of the Most High hath fixed, for these are the breath of life unto all created things. The seas of Divine wisdom and Divine utterance have risen under the breath of the breeze of the All-Merciful. Hasten to drink your fill, O men of understanding! They that have violated the Covenant of God by breaking His commandments, and have turned back on their heels, these have erred grievously in the sight of God, the All-Possessing, the Most High.

Baha'u'llah, The Kitáb-i-Aqdas (The Most Holy Book), p. 19