What is meant by personal God is a God Who is conscious of His creation, Who has a Mind, a Will, a Purpose, and not, as many scientists and materialists believe, an unconscious and determined force operating in the universe. Such conception of the Divine Being, as the Supreme and ever present Reality in the world, is not anthropomorphic, for it transcends all human limitations and forms, and does by no means attempt to define the essence of Divinity which is obviously beyond any human comprehension. To say that God is a personal Reality does not mean that He has a physical form, or does in any way resemble a human being. To entertain such belief would be sheer blasphemy.
(Shoghi Effendi, Lights of Guidance, p. 477)
Within a compass of two hundred pages it [Kitáb-i-Aqdas] proclaims unequivocally the existence and oneness of a personal God, unknowable, inaccessible, the source of all Revelation, eternal, omniscient, omnipresent and almighty.
(Shoghi Effendi, God Passes By, p. 138)