Heart of Jesus, in who are all the treasures of wisdom and knowledge, have mercy on us.

…2 that their hearts may be encouraged as they are knit together in love, to have all the riches of assured understanding and the knowledge of God’s mystery, of Christ, 3 in whom are hid all the treasures of wisdom and knowledge.   (Colossians 2:2–3)

First, looking at these two verses from St. Paul, one can easily see that the writer of the Litany of the Sacred Heart had the letter to the Colossians in mind for the above prayer verse.  Secondly, this verse from the Litany helps us to know Jesus, and wisdom and knowledge are treasures that we should want to possess.