The Practice of the Presence of God

Remember what I advised you to do: Think about God as often as you can, day and night, in everything you do. He is always with you. Just as you would be rude if you deserted a friend who was visiting you, why would you be disrespectful of God by abandoning His presence?

Do not forget Him! Think of Him often. Adore Him ceaselessly. Live and die with Him. That is the real business of Christians. -Brother Lawrence

References:

Brother Lawrence, The Practice of the Presence of God