A twofold obligation resteth ...

The ordinances of God have been sent down from the heaven of His most august Revelation. All must diligently observe them Man's supreme distinction, his real advancement, his final victory; have always depended, and will continue to depend, upon them Whoso keepeth the commandments of God shall attain everlasting felicity. A twofold obligation resteth upon him who hath recognized the Day Spring of the Unity of God, and acknowledged the truth of Him Who is the Manifestation of His oneness. The first is steadfastness in His love, such steadfastness that neither the clamor of the enemy nor the claims of the idle pretender can deter him from cleaving unto Him Who is the Eternal Truth, a steadfastness that taketh no account of them whatever. The second is strict observance of the laws He hath prescribed--laws which He hath always ordained, and will continue to ordain, unto men, and through which the truth may be distinguished and separated from falsehood.

Gleanings From the Writings of Bahá’u’lláh