Let each of us accept the truth of the following statement and try to make it our most fundamental principle: Christ's teaching will never let us down, while worldly wisdom always will. Christ Himself said that this sort of wisdom was like a house with nothing but sand as its foundation, while His own was like a building with solid rock as its foundation.

Vincent de Paul and Louise de Marillac: Rules, Conferences, and Writings (ed. Paulist Press, 1995) - ISBN: 9780809135646