The sacred heart of Jesus is a famous salute of Christian faith. It shows Jesus' great love for the world with Jesus' heart exposed outside, around the crown, scars and flames, so as to appeal to the world to make amends for their sins and love each other.

The sacred heart of Jesus is the fountain of living water. When the spear pierces his side, the fountain opens. Historically speaking, this is the earliest theology about the sacred heart of Jesus expounded by the Godfathers.

Source: @hebeisen.tattoo.and.painting