John 4:24

God is a Spirit - This is one of the first, the greatest, the most sublime, and necessary truths in the compass of nature! There is a God, the cause of all things - the fountain of all perfection - without parts or dimensions, for he is Eternal - filling the heavens and the earth - pervading, governing, and upholding all things: for he is an infinite Spirit! This God can be pleased only with that which resembles himself: therefore he must hate sin and sinfulness; and can delight in those only who are made partakers of his own Divine nature. As all creatures were made by him, so all owe him obedience and reverence; but, to be acceptable to this infinite Spirit, the worship must be of a spiritual nature - must spring from the heart, through the influence of the Holy Ghost: and it must be in Truth, not only in sincerity, but performed according to that Divine revelation which he has given men of himself. A man worships God in spirit, when, under the influence of the Holy Ghost, he brings all his affections, appetites, and desires to the throne of God; and he worships him in truth, when every purpose and passion of his heart, and when every act of his religious worship, is guided and regulated by the word of God. "The enlightened part of mankind," says Abu'l Fazel, "knows that true righteousness is an upright heart; and believe that God can only be worshipped in holiness of Spirit." Ayeen Akbery, vol. iii. p. 254.

"Of all worshippers," says Creeshna, "I respect him as the most devout, who hath faith in me, and who serveth me with a soul possessed of my spirit." Geeta, p. 68.