Where did the saying "cross my heart, hope to die, stick a needle in my eye" originate?

The other day, joking around, I said to someone after they promised me something, "cross your heart, hope to die, stick a needle in your eye?" Then after I said it I was curious where that saying started and what it meant. I mean, it seems kind of obvious, hope to die and needle in eye and all, but I was... show more The other day, joking around, I said to someone after they promised me something, "cross your heart, hope to die, stick a needle in your eye?" Then after I said it I was curious where that saying started and what it meant. I mean, it seems kind of obvious, hope to die and needle in eye and all, but I was curious if there was a deeper less obvious meaning to it.
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