The following passage is taken from the Introduction to the Devout Life.
Strive as often as possible through the day to place yourself in God's Presence by some one of the methods already suggested.
Consider what God does, and what you are doing;--you will see His Eyes ever fixed upon you in Love incomparable. "O my God," you will cry out, "why cannot I always be looking upon Thee, even as Thou lookest on me? why do I think so little about Thee? O my soul, thy only resting-place is God, and yet how often dost thou wander?" The birds have nests in lofty trees, and the stag his refuge in the thick coverts, where he can shelter from the sun's burning heat; and just so, my daughter, our hearts ought daily to choose some resting-place, either Mount Calvary, or the Sacred Wounds, or some other spot close to Christ, where they can retire at will to seek rest and refreshment amid toil, and to be as in a fortress, protected from temptation. Blessed indeed is the soul which can truly say, "Thou, Lord, art my Refuge, my Castle, my Stay, my Shelter in the storm and in the heat of the day."
Be sure then, my child, that while externally occupied with business and social duties, you frequently retire within the solitude of your own heart. That solitude need not be in any way hindered by the crowds which surround you-- they surround your body, not your soul, and your heart remains alone in the Sole Presence of God. This is what David sought after amid his manifold labours;--the Psalms are full of such expressions as "Lord, I am ever with Thee. The Lord is always at my right hand. I lift up mine eyes to Thee, O Thou Who dwellest in the heavens. Mine eyes look unto God."
There are few social duties of sufficient importance to prevent an occasional retirement of the heart into this sacred solitude. When S. Catherine of Sienna was deprived by her parents of any place or time for prayer and meditation, Our Lord inspired her with the thought of making a little interior oratory in her mind, into which she could retire in heart, and so enjoy a holy solitude amid her outward duties. And henceforward, when the world assaulted her, she was able to be indifferent, because, so she said, she could retire within her secret oratory, and find comfort with her Heavenly Bridegroom. So she counselled her spiritual daughters to make a retirement within their heart, in which to dwell.
Do you in like manner let your heart withdraw to such an inward retirement, where, apart from all men, you can lay it bare, and treat face to face with God, even as David says that he watched like a "pelican in the wilderness, or an owl in the desert, or a sparrow sitting alone upon the housetop." These words have a sense beyond their literal meaning, or King David's habit of retirement for contemplation;--and we may find in them three excellent kinds of retreats in which to seek solitude after the Saviour's Example, Who is symbolised as He hung upon Mount Calvary by the pelican of the wilderness, feeding her young ones with her blood. So again His Nativity in a lonely stable might find a foreshadowing in the owl of the desert, bemoaning and lamenting: and in His Ascension He was like the sparrow rising high above the dwellings of men.
Thus in each of these ways we can make a retreat amid the daily cares of life and its business.