Valentine Heart

As metaphor
In mythology, spirituality and religion
In religious texts the heart has historically been ascribed much mystical significance, either as metaphor or as an organ genuinely believed to have spiritual or divine attributes.
In Egyptian mythology, the heart portion of the soul was weighed in a balance against the feather of Ma'at, symbolising truth, in the judgment of the dead in the Egyptian Book of the Dead. Egyptian sources do not actually reveal whether the heart had to be lighter than the feather for the deceased to pass into paradise - all depictions show only the weighing of the heart, not the actual results, heavier or lighter.