On the Benefits of Continual Conversation With God
(from The Practice of the Presence of God, by Brother Lawrence, Fifth Letter)
I know that for the right practice [of the presence of God], the heart must be empty of all other things; because God will possess the heart alone; and as he cannot possess it alone without emptying it of all besides, so neither can He act there, and do in it what He pleases, unless it be left vacant to Him.