This quote comes from a sermon by St. Augustine, Bishop of Hippo. Sounds a lot like an expression commonly heard in 12 step communities: You can’t just talk the talk and expect to get anywhere – you’ve got to walk it.
Augustine encourages us to “sing to the Lord a new song,” but to be careful that our actions don’t contradict our words. He admonishes us: “sing with your voices, your hearts, your lips and your lives.”
Augustine is telling us that, if we are careful to practice the principles of living well – if we strive daily to love God with all our hearts and souls and minds and to love our neighbors as ourselves — then we not only will be praising God through our actions, we ourselves will become God’s praise.
 Wright, J. Robert, Readings for the Daily Office from the Early Church. New York: Church Publishing Inc., 1991, pp 290-291.