One of these, the Feast of the Sacred Heart, commemorated June 11 this year, is derived from the belief of the mercy of God through Jesus' sacrifice on the Cross, the event, celebrated in "unbloody manner" by every Holy Eucharist in the Mass, but particularly last Sunday, the Feast of Corpus Christi.
The devotion to the Sacred Heart, intimately related to the mystery, however, is not merely an addendum of sorts, such as sprinkling of water, a sacramental reminding us of our baptism, or prayers crafted to honor a favorite saint. It is pivotal to our embrace of God's Mercy, once we recognize the spiritual defects we carry, namely sin. In the world of human devotion it is the heart that matters, that central designation of both human relationships and human-Divine matters. So much so that what is in the heart measures the worth of what we do or fail to do, not just the act itself.