Posted every second day…

July 31

Today the most important affair is delivering the Cause of God and spreading the fragrances of God. The duty of every soul among the believers of God is that he must rest neither day nor night, and with every breath think of the diffusion of the fragrances of Truth. That is, he must endeavor as far as lies in his power to quicken and guide a soul to the Path of Immortality, for this service of his will be perpetuated throughout centuries and cycles.

The power of the faith of the first guide will be transmitted, find continuation and become manifest in the lives of other believers, until one sanctified soul will become the cause of quickening a hundred thousand souls. Consider how important this is, for the guidance of one soul is greater than the sovereignty of a kingdom. The temporal dominion is ended in a few days and no effect or result, no rejoicing or happiness, no beatitude or praise and no name or fame is produced thereby. But this sovereignty which consists in the guidance of the souls is eternal and everlasting. It embraces the Divine Beloved and it establishes man upon the throne of grandeur. Therefore, Spiritual Assemblies must be established in all the cities and their aims must be the guidance of the souls. 
('Abdu'l-Baha, from a Tablet, Star of the West, vol. 1, no. 11, September 27, 1910)