"But the question may be asked: How shall we know God?"

"But the question may be asked: How shall we know God? We know Him by His attributes. We know Him by His signs. We know Him by His names. We know not what the reality of the sun is, but we know the sun by the ray, by the heat, by its efficacy and penetration. We recognize the sun by its bounty and effulgence, but as to what constitutes the reality of the solar energy, that is unknowable to us. The attributes characterizing the sun, however, are knowable. If we wish to come in touch with the reality of Divinity, we do so by recognizing its phenomena, its attributes and traces, which are widespread in the universe. All things in the world of phenomena are expressive of that one reality. Its lights are shining, its heat is manifest, its power is expressive, and its education, or training, resplendent everywhere. What proof could there be greater than that of its functioning or its attributes which are manifest?"
-'Abdu'l-Baha, Promulgation of Universal Peace, p. 422
10 November 1912

"God has not intended man to imitate blindly his fathers and ancestors."

"Furthermore, know ye that God has created in man the power of reason, whereby man is enabled to investigate reality. God has not intended man to imitate blindly his fathers and ancestors. He has endowed him with mind, or the faculty of reasoning, by the exercise of which he is to investigate and discover the truth, and that which he finds real and true he must accept. He must not be an imitator or blind follower of any soul. He must not rely implicitly upon the opinion of any man without investigation; nay, each soul must seek intelligently and independently, arriving at a real conclusion and bound only by that reality. The greatest cause of bereavement and disheartening in the world of humanity is ignorance based upon blind imitation. It is due to this that wars and battles prevail; from this cause hatred and animosity arise continually among mankind."
-Abdu'l-Baha, Promulgation of Universal Peace, p. 291
29 August 1912