What does a sacred heart tattoo symbolize?

The Sacred Heart is a religious devotion to Jesus' physical heart as the representation of the divine love for humanity. I have a sacred (or "eternal flame") heart tattoo...I got it to symbolize that my feelings for the person I got it for and the memories I have of them are important and never ending (that person is deceased). I'm not sure of the typical definition of the sacred heart tattoo, but I know that whenever I look at mine it symbolizes a person and time in my life that I hold sacred. The Sacred Heart is from Christian Origins.
The Heart represents the heart of christ, and his love for the world
while the crown of thorns represents...well..the crown of thorns... digging into the heart, which is usually bleeding, to represent the pain and suffering Christ felt.
The Cross on top of the heart is the crucifix on which Christ died, and the fire behind the cross usually coming up from the heart, is to represent the fire on the threshing floor...to burn everything away and start new
from Matthew
"He will make a thorough clearance of His threshing-floor, gathering His wheat into the storehouse, but burning up the chaff in unquenchable fire"