Not to allow anything “to intervene between him and God”

Should a man wish to adorn himself with the ornaments of the earth, to wear its apparels, or partake of the benefits it can bestow, no harm can befall him, if he alloweth nothing whatever to intervene between him and God, for God hath ordained every good thing, whether created in the heavens or in the earth, for such of His servants as truly believe in Him. Eat ye, O people, of the good things which God hath allowed you, and deprive not yourselves from His wondrous bounties. Render thanks and praise unto Him, and be of them that are truly thankful. 

- Baha’u’llah,  (’Gleanings from the Writings of Baha’u’llah’; The Compilation of Compilations, vol. I, Conservation of the Earth's Resources)