Bahá’í Sacred Writings, ‘Abdu’l-Bahá, #393

Wherefore, O ye faithful friends, it behoveth you all to join ‘Abdu’l-Bahá in self-sacrifice and in service to the Cause of God and thraldom to His divine Threshold. If ye be aided to attain unto such a supreme bounty, the whole world shall erelong be made the recipient of the effulgent splendours of God, and the longed-for oneness of humanity shall be revealed in the utmost beauty and charm in the midmost heart of the world. This is the dearest wish of ‘Abdu’l-Bahá! This is the greatest yearning of them that are faithful! The Glory of Glories rest upon you.