When he [Karol Wojtyla] was 10 or 12, he was a choirboy. But his father noticed he was not so diligent. One day, his dad told him, "You are not being a goood choirboy. You don't pray to the Holy Spirit enough. You ought to pray to him." And his father taught Karol a prayer which he said he hadn't forgotten.
(Frossard, Portrait, p74; quoted in O'Connor, p 17)