May 25

…the world of humanity cannot truly advance through mere physical powers and intellectual attainments. Nay rather, in order that the world may really and wonderfully advance, the protection of the Holy Spirit is needed; the Divine Father must assist the human world to attain maturity. The human body is in need of material force, but the spirit has need of the Holy Spirit. Were it not for the protection of the Holy Spirit the human world would be extinguished.

His Holiness Jesus Christ declared "Let the dead bury the dead." This statement of His Holiness indicates “That which is born of the flesh is flesh, and that which is born of the Spirit is spirit," and it becomes manifest that the human spirit which is not protected beneath the Holy Spirit is dead. It is clear that the human spirit is in need of the resuscitation of the Holy Spirit, otherwise though materially advanced, man cannot attain frill and complete progress. 
- 'Abdu'l-Baha  (From a talk, June 9, 1912’ Baptist Temple, Philadelphia; Star of the West, vol. 5, no. 7, July 13, 1914)