The soul is stronger than its surroundings.
The states of consciousness are all that psychology needs to do her work with. Metaphysics or theology may prove the Soul to exist; but for psychology the hypothesis of such a substantial principle of unity is superfluous.
But petitional prayer is only one department of prayer; and if we take the word in the wider sense as meaning every kind of inward communion or conversation with the power recognized as divine, we can easily see that scientific criticism leaves it untouched. Prayer in this wide sense is the very soul and essence of religion.