This blog has had many posts concerning the "Manifestations of God" (Here are just a few...).
Their Appearance in our physical world is the prime reason for humanity's evolution.
"....when the Holy Manifestation of God, Who is the sun of the world of His creation, shines upon the worlds of spirits, of thoughts and of hearts, then the spiritual spring and new life appear, the power of the wonderful springtime becomes visible, and marvelous benefits are apparent. As you have observed, at the time of the appearance of each Manifestation of God extraordinary progress has occurred in the world of minds, thoughts and spirits. For example, in this divine age see what development has been attained in the world of minds and thoughts, and it is now only the beginning of its dawn. Before long you will see that new bounties and divine teaching will illuminate this dark world and will transform these sad regions into the paradise of Eden."
Saturday, December 29, 2007
‘Abdu’l-Bahá: Some Answered Questions, Chapter 42: "The Power and Influence of the Divine Manifestations", p. 163