It's Day 9 of the Novena, and the O antiphons have spelled out for us what it means: "Tomorrow I shall be."
" 'The harvest is abundant' (Mt 9:37), the divine Teacher repeats even today: Many have not met him yet and are waiting for the first proclamation of his Gospel: the enthusiasm of others, despite having received Christian formation, has waned, and they maintain only a superficial contact with the word of God; still others have fallen away from the practice of their faith and are in need of a new evangelization. Nor is there a lack of righteous persons asking essential questions on the meaning of life and death, questions to which only Christ can supply a fulfilling response. It becomes therefore indispensable for Christians on every continent to be ready to respond to whomever asks the reason for the hope that is within them (cf. 1 Pet 3:15), announcing the Word of God with joy and living the Gospel without compromise."
Pope Benedict XVI