19 The heart is also capable of unifying and harmonizing our personal history, which may seem hopelessly fragmented, yet is the place where everything can make sense. The Gospel tells us this in speaking of Our Lady, who saw things with the heart. She was able to dialogue with the things she experienced by pondering them in her heart, treasuring their memory and viewing them in a greater perspective. The best expression of how the heart thinks is found in the two passages in Saint Luke’s Gospel that speak to us of how Mary “treasured ( synetérei ) all these things and pondered ( symbállousa ) them in her heart” (cf. Lk 2:19 and 51). The Greek verb symbállein , “ponder”, evokes the image of putting two things together (“symbols”) in one’s mind and reflecting on them, in a dialogue with oneself. In Luke 2:51, the verb used is dietérei , which has the sense of “keep”. What Mary “kept” was not only her memory of what she had seen and heard, but also those aspects of it that she did not yet understand; these nonetheless remained present and alive in her memory, waiting to be “put together” in her heart.
Source: Dilexit Nos (Vatican.va)