ONE morning long ago our Lord sat on the western slope of Mount Olivet and gazed on the chosen city of His chosen people. But His Sacred Heart was sad, for He was thinking of the squandered graces and lost opportunities of His flock, that would not listen to the pleadings of His tenderest love. One cry of regret for their hardness escaped His lips: "If thou hadst known,"From the tabernacle that cry is often repeated as the years go by. Again our Lord...