"It behoveth every one in this Day of God to dedicate himself to the teaching of the Cause with utmost prudence and steadfastness."

"How strange that despite this ringing Call, despite the appearance of this most wondrous Revelation, We notice that men, for the most part, have fixed their hearts on the vanities of the world and are sorely dismayed and troubled by reason of prevailing doubts and evil suggestions. Say: This is the Day of God Himself; fear ye God and be not of them that have disbelieved in Him. Cast the idle tales behind your backs and behold My Revelation through Mine eyes. Unto this have ye been exhorted in heavenly Books and Scriptures, in the Scrolls and Tablets.

Arise thou to serve the Cause of thy Lord; then give the people the joyful tidings concerning this resplendent Light whose revelation hath been announced by God through His Prophets and Messengers. Admonish everyone moreover to observe prudence as ordained by Him, and in the Name of God advise them, saying:
It behoveth every one in this Day of God to dedicate himself to the teaching of the Cause with utmost prudence and steadfastness. Should he discover a pure soil, let him sow the seed of the Word of God, otherwise it would be preferable to observe silence."

-Bahá'u'lláh, Tablets of Bahá’u’lláh Revealed After the Kitáb-i-Aqdas, pp. 241-242