Physicians might, I believe, extract greater utility from odours than they do, for I have often observed that they cause an alteration in me and work upon my spirits according to their several virtues; which makes me approve of what is said, that the use of incense and perfumes in churches, so ancient and so universally received in all nations and religions, was intended to cheer us, and to rouse and purify the senses, the better to fit us for contemplation.