O people of Bahá ...

By the righteousness of God! The world and its vanities, and its glory, and whatever delights it can offer, are all, in the sight of God, as worthless as, nay, even more contemptible than, dust and ashes. Would that the hearts of men could comprehend it! Cleanse yourselves thoroughly, O people of Bahá, from the defilement of the world, and of all that pertaineth unto it. God Himself beareth Me witness. The things of the earth ill beseem you. Cast them away unto such as may desire them, and fasten your eyes upon this most holy and effulgent Vision.
Say: Let truthfulness and courtesy be your adorning. Suffer not yourselves to be deprived of the robe of forbearance and justice, that the sweet savors of holiness may be wafted from your hearts upon all created things. Say: Beware, O people of Bahá, lest ye walk in the ways of them whose words differ from their deeds. Strive that ye may be enabled to manifest to the peoples of the earth the signs of God, and to mirror forth His commandments. Let your acts be a guide unto all mankind, for the professions of most men, be they high or low, differ from their conduct. It is through your deeds that ye can distinguish yourselves from others. Through them the brightness of your light can be shed upon the whole earth. Happy is the man that heedeth My counsel, and keepeth the precepts prescribed by Him Who is the All-Knowing, the All-Wise.

Bahá'u'lláh