The first psalm of Vigils, the penitential psalm par excellence, contains much that is worth pondering as the day unfolds. Different lines bubble up at different moments. The fact that God "loves truth in the heart" is wonderfully reassuring, while the psalmist's cry to know again "the joy of [God's] help" resonates deeply with the longing we most of us experience. It is, however, the prayer for a pure heart that speaks to me this morning. A pure heart is one which allows the light to shine through, which lets the love of God be its life-blood.