One way to recollect the mind easily in the time of prayer, and preserve it more in tranquillity, is not to let it wander too far at other times. You should keep it strictly in the Presence of God; and, being accustomed to think of Him often, you will find it easy to keep your mind calm in the time of prayer, or at least to recall it from its wanderings.

Brother Lawrence (c.1614-1691)The Practice of the Presence of God
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