Heart or brain?

[Dna8]

the key to life is survival. if you rely on the heart, you will be destroyed. history proves that the strongest are the cruel one, not those who have heart. not only cruel, but they are also geniuses (brains) in their fields. so the answer is clear, BRAIN

My brain is like a second heart.

[Celestia]

Heart.

[ixulescu]

depends on domain.

[Daco Celtic]

lower back

[Marinus]

Brain.

You won't have anything left for your heart to enjoy if you keep on making impulsive thoughtless decisions.