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These aren't my words, but they're useful!
Intelligence is the work of a person's mind. It's the world they create themselves. A person, being endowed with a creative consciousness, has created their own world in which they have invented their own laws and rules. They are all relative and do not represent an accurate or permanent description of the objective world, but they do, to some extent, accurately describe each person's own world and their own laws at a given moment in time. They change depending on the change in a person's worldview. I would also say that intelligence is the "freedom of choice" that the Absolute has given us. Intelligence is also a training ground for the growth of our consciousness. It is through it that we make mistakes, suffer, and learn from our mistakes. It is an essential condition for our growth towards the state of the Absolute. Intelligence is only possible in the soul when it is embodied. A person with a low level of intelligence may be either highly spiritually developed or not, but during this life, the increase in spiritual development will be small. A high level of intelligence is important both in material achievements and in spiritual growth.