A reasonable person is one who understands the un-reasonability of an unreasonable person and helps him/her to overcome his/her limitations, and makes him/her a reasonable person.
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This task is difficult for most of us, but our efforts should be in that direction.
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However, if your efforts fail on the third trial, then you can leave that person on his/her own conditions.
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You need not then worry about any more obligations.
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