"Every experience proves that the real problem of our existence lies in the fact that we ought to love one another, but do not."

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There's no such thing as a painless lesson. They just don't exist. Sacrifices are necessary. You can't gain anything without losing something first although if you can endure that pain and walk away from it, you'll find that you now have a heart strong enough to overcome any obstacle. Yeah, a heart made fullmetal.

— Hiromu Arakawa