Consider equally the differences between individual men.   The Christ was in the form of man, and Caiaphas was in the form of man; Moses and Pharaoh, Abel and Cain, Bahá'u'lláh and Yahya, were men.

Man is said to be the greatest representative of God, and he is the Book of Creation because all the mysteries of beings exist in him.  If he comes under the shadow of the True Educator and is rightly trained, he becomes the essence of essences, the light of lights, the spirit of spirits; he becomes the center of the divine appearances, the source of spiritual qualities, the rising-place of heavenly lights, and the receptacle of divine inspirations.  If he is deprived of this education he becomes the manifestation of satanic qualities, the sum of animal vices, and the source of all dark conditions.

The reason of the mission of the Prophets is to educate men; so that this piece of coal may become a diamond, and this fruitless tree may be engrafted, and yield the sweetest, most delicious fruits. When man reaches the noblest state in the world of humanity, then he can make further progress in the conditions of perfection, but not in state; for such states are limited, but the divine perfections are endless

(Abdu'l-Baha, Baha'i World Faith - Abdu'l-Baha Section, p. 332)