Catholic practices are our rules of etiquette. It is attention paid to our Father and to His children here and in heaven, attention especially due in God's own house. It is faith exercised in the humblest way, but we cannot mount the heights of faith if we are careless of these little things. Courtesy is the first ingredient of love. Church manners or practices enlist the body in the service of God in an eminently practical and really easy way.
Prayer grows in the mind as the body is reverently disposed.
Our minds and hearts easily go out of control if we pay no attention to bodily behavior.