Bernard of Clairvaux, Monastic and Theologian, 1153
O God, by whose grace your servant Bernard of Clairvaux, kindled with the flame of your love, became a burning and a shining light in your Church: Grant that we also may be aflame with the spirit of love and discipline and walk before you as children of light; through Jesus Christ our Lord, who lives and reigns with you and the Holy Spirit, one God, now and for ever. Amen.
More information about Bernard can be found at The Lectionary, by James Kiefer. See - http://www.satucket.com/lectionary/Bernard_Clairvaux.htm