A quaint trefoil window in the old sacristy of St. Michael's Cathedral. The trefoil is a common symbol of the Trinity.
O eternal Trinity, You are a deep sea in which the more I seek the more I find, and the more I find, the more I seek to know You. You fill us insatiably, because the soul, before the abyss which You are, is always famished; and hungering for You, O eternal Trinity, it desires to behold truth in Your light. As the thirsty heart pants after the fount of living water, so does my soul long to leave this gloomy body and see You as You are, in truth.
- St. Catherine of Siena