Blood and Water

This is the image of the vision that Saint Faustina saw (close enough...she actually was a bit upset that it wasn't exactly the vision- he probably looked less like Brad Pitt and more Semetic and like the Shroud of Turin image because Jesus is Israeili Jewish...)
The red depicts his blood (the blood of the covenant, the blood shed for the atoning sacrificial forgiveness of sins) and the blue depicts the water that poured from him when he was lanced. There was a build up of water because it occurs from the severity of the scourging- the torture that occured just prior to his crucifiction. The injuries caused swelling and water to build up that was expelled when he was punctured by a lance of a roman soldier while on the Cross.
Water also symbolized baptism and purification. Jesus is the "living water." The water that will allow us to never be thirsty if we drink of it.
Where else in the natural do you see blood and water pouring out like this? Birth.
When a mother is going to deliver a baby the first thing that happens is that her "water breaks."
Then when a baby is born it is covered in her blood and her blood pours out of her. Blood and water.
This blood and water pouring from the heart of Jesus is meant to depict the new birth, new life that is found in and through his sacrifice. It came with suffering. The water was produced through his innocent suffering. This the broken water for our new birth.
Nicodemus asked, how is it that a man is born anew- does he enter his mother's womb a second time? No, Jesus meant when he said that a man must be born again, that he is born again through Jesus' water breaking, and his blood shed and his innocent suffering sacrifice for us to form the new covenant of life. This blood and water comes from his heart so we are born of the Holy Spirit into the Sacred Love of his heart. It is the manifestation of his love. It pours from his Sacred Heart. He is Love, He loves so much that he himself became the sacrifice shedding of blood so he could bring us to new life through the breaking of his water, birthing us into new creatures in his Love, birthing us into eternal life.
If the Sacred Heart pouring out blood and water does not point you to doing likewise to creating new life, there is something wrong. Meditate on it again. And Again. And Again.