Hold yourself in prayer before God, like a dumb or paralytic beggar at a rich man’s gate. Let it be your business to keep your mind in the presence of the Lord. If it sometimes wander and withdraw itself from Him, do not much disquiet yourself for that: trouble and disquiet serve rather to distract the mind than to re-collect it: the will must bring it back in tranquility. If you persevere in this manner, God will have pity on you.
–Brother Lawrence (1614-1691)