Caryll Houselander once wrote,
It seems that this is Christ's favorite way of being recognized, that He prefers to be known, not by His own human features, but by the quickening of His own life in the heart, which is the response to His coming. When John recognized Him, he was hidden in his mother's womb. After the Resurrection He was known, not by his familiar features, but by the love in Magdalene's heart, the fire in the hearts of the travelers to Emmaus, and the wound in His own heart handled by Thomas.
Yes, we can know Christ through the meditation of theological truths, the unpacking of Sacred Scripture, and the sacraments, just to name a few. But when our hearts are moved in a particular way to the good—which is to say, to God—then we are in the midst of knowing Christ.