Pope Leo XIII – Since there is in the sacred heart …
Since there is in the sacred heart a symbol and a sensible image of the infinite love of Jesus Christ which moves us to love one another, therefore it is fitting and proper that we should consecrate ourselves to his most sacred heart — an act which is nothing else than an offering and a binding of one’s self to Jesus Christ, seeing that whatever honor, veneration, and love is given to his divine heart is really and truly given to Christ himself.
— Pope Leo XIII