In his Message for Lent this year, Pope Bendict brings it on home with the Church Fathers:

The Fathers of the Church considered these elements as symbols of the sacraments of Baptism and the Eucharist. Through the water of Baptism, thanks to the action of the Holy Spirit, we are given access to the intimacy of Trinitarian love. In the Lenten journey, memorial of our Baptism, we are exhorted to come out of ourselves in order to open ourselves, in trustful abandonment, to the merciful embrace of the Father (cf. Saint John Chrysostom, Catecheses, 3,14ff). Blood, symbol of the love of the Good Shepherd, flows into us especially in the Eucharistic mystery: “The Eucharist draws us into Jesus’ act of self-oblation … we enter into the very dynamic of His self-giving” (Encyclical Deus caritas est, 13). Let us live Lent then, as a “Eucharistic” time in which, welcoming the love of Jesus, we learn to spread it around us with every word and deed.