Baha'u'llah taught that man is like "a mine rich in gems of inestimable value." A purpose of this life is to develop spiritual faculties, which are like the limbs and organs needed to progress spiritually in the next world.
'Abdu'l-Baha wrote: "Consider how a being, in the world of the womb, was deaf of ear and blind of eye, and mute of tongue; how he was bereft of any perceptions at all. But once, out of that world of darkness, he passed into this world of light, then his eye saw, his ear heard, his tongue spoke. In the same way, once he hath hastened away from this mortal place into the Kingdom of God, then he will be born in the spirit; then the eye of his perception will open, the ear of his soul will hearken, and all the truths of which he was ignorant before will be made plain and clear."
He further wrote: "As to thy question regarding discoveries made by the soul after it hath put off its human form: certainly, that world is a world of perceptions and discoveries...It is similar to the condition of a human being in the womb, where his eyes are veiled, and all things are hidden away from him. Once he is born out of the uterine world and entereth this life, he findeth it, with relation to that of the womb, to be a place of perceptions and discoveries, and he observeth all things through his outer eye. In the same way, once he hath departed this life, he will behold, in that world whatsoever was hidden from him here: but there he will look upon and comprehend all things with his inner eye."