I also wanted to share here a piece I found on meditation from Baha'i sources:
"Man's spirit comprehends the realities of kingdoms which have no knowledge of him, even as the child in the womb has no knowledge of exterior existence; nevertheless, the mother comprehends the child's existence. The superior kingdom understands the inferior, but that the inferior comprehends it is no proof of the non-existence of the superior kingdom. In the human world, if we do not understand the divine world, is that a proof that the world of God does not exist? When we view the universe we see it as endless space, for we cannot restrict the universe to the lower kingdoms and to man who is here for a few days only, then vanishes.
"This physical universe is infinite, and if material existence is endless, how much more so are the worlds of God! When we think of the visible worlds as infinite, how can we think that the worlds of God are limited? There is no beginning and no end to the material or spiritual worlds. Man passes through different phases and when in a lower consciousness he cannot comprehend the consciousness above. When we were in the state of the unborn child we had no knowledge of the world of man. If the vegetable kingdom could speak it would cry out, "Where is the world of man?" We cry out, "Where is the kingdom of the spirit?"
My hope for you is that as you travel through the universe of existence you will ever become acquainted with new and wonderful significances; that your knowledge will ever be increased - knowledge without limitation; then you will understand the realities existing in all kingdoms. Capacity is in accordance with striving and sincerity.
"I pray that your inner sight may become clear, that you may be able to perceive things the heedless do not see, that you may understand the infinite worlds of God. A man who has no knowledge of the heavenly universe has missed a portion of his heritage and is like unto a stone which knows nothing of humanity. May God open your inner sight, so that you may know his secrets, attain to the highest degree of existence, become manifestors of a spiritual humanity and have your share of the heavenly wisdom that BAHA'O'LLAH bestows. These divine effulgences have enveloped the Orient and Occident, but the eyes know not how to perceive, the intelligences are weak and so men are deprived and are in manifest loss. I commend you to turn towards the kingdom of El-Abha, so that the divine mysteries may be revealed."
~ Abdu'l-Baha, Divine Philosophy, p. 117