A striking feature of the angel’s greeting is that he does not address Mary with the usual Hebrew salutation shalom – peace be with you – chaíre, which we might well translate with the word “Hail,” as in the Church’s Marian prayer, pieced together from the words of the annunciation narrative (cf. Lk 1:28, 42). Yet at this point it is only right to draw out the true meaning of the word chaíre: rejoice! This exclamation from the angel – we could say – marks the true beginning of the New Testament.
Pope Emeritus Benedict XVI

When You Have An Evil Thought, Do This! | St. Alphonsus Liguori
"When an evil thought is presented to the mind, we must immediately endeavor to turn our thoughts to God, or to something which is indifferent. But the first rule is, instantly to invoke the names of Jesus and Mary and to continue to invoke them until the temptation...