“The soul that is attached to anything, however much good there may be in it, will not arrive at the liberty of divine union. For whether it be a strong wire rope or a slender and delicate thread that holds the bird, it matters not, if it really holds it fast; for, until the cord be broken, the bird cannot fly.”
– Saint John of the Cross
Source: http://www.saintsquotes.net/Selection%20-%20Sparrows.html