3 Prayers Catholics Need to Memorize (but Don't)

Fr. Mark-Mary has 3 prayers that he has found are vital to memorize. Spoiler: we're not talking about the Hail Mary or the Our Father here.

Why memorize these prayers? What's wrong with having it on your phone, or seeking out printed prayers in church? Basic prayer memorization is a beautiful part of Catholic formation, and having these prayers written on your heart truly change you.