Children are born with an individual personality that was developed throughout their previous incarnations as a human. That personality is not imutable. In their first years reincarnated, though, they are very susceptible to the environment and people around them, which could lead them to develop minor or major changes in their personalities.
Using our consciousness to learn lessons through our lives, we can change our opinions and behaviors, affecting directly manifestations of our personality. A greedy person, for instance, can change into a very generous person, a weak could turn into a strong person, and so forth.
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