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It's not made very clear though.
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Abe says at the beginning “I thought I had a good job”, implying he was happy with his lot in life and had no real reason to break out.
There are no tips, pointers or tutorials that teach the player to chant. It’s subtle, but this implies Abe always had the latent ability but was never taught to use it. The first in-game tutorial for chanting appears in the Monsaic Lines, so we can say that this is where he learns how to use this ability.
So we have plot-related and gameplay-related justifications for his not using possession to break out in the past.