But I'm not sure what you mean by some of them. Correct me if I guess wrong.
I would only suggest you consider where "ego" comes from; I mean it doesn't just pop out of an egg fully formed, does it?
Are you asking about the development of ego? I think the first time a baby cries - that behavior was caused by the "ego" that they were born with. In that sense, ego is a motivator (emotional force) behind behavior that is most directly concerned with survival. Survival is simply the process of preserving one's identity. Ego is an "identity protector".
I don't think one's ego changes so much during development - though I think it can become a stronger or weaker force in one's personality - depending on how besieged we feel as we grow up. I think those who's survival (identity) is often besieged as they mature will probably form a personality around an ego that is somewhat more defensive toward life, generally.
And also, consider how your idea relates to the one I mentioned here a while back that self-interest is the surest guide to human behavior.
Yes, I remember that exchange. I think it relates well.
Sometimes I consider that the primary function of human "thinking" is to construct socially acceptable rationalizations for the dictates of instinct and self-interest.
You are definitely going down the right track there IMO.
Beliefs have their effect on us through emotion. The emotions attached to our beliefs provide the "force" behind behavior choice. Even behavior as simple as changing the channel on our TV is due to a temporary and relatively weak emotional belief that channel 6 is better at that moment than channel 4. But, if insufficient emotion is available to back up that belief, then we just won't bother.
Humans get all the usual mammalian inputs to our belief formation mechanism - like instinct, event memory, social awareness, sex drive, etc. But we also have access to another one - intellect.
If we already have beliefs that cover a problem we face - we'll use them. Thinking requires more metabolic energy. Also, using our trusted beliefs just feels more secure. We were there before. It worked before. What's to worry about? Egos like to feel secure.
We use intellect when we don't have beliefs that we are confident in for a situation. We don't rethink the streets we take to get to Safeway every time we go there. We have that route in memory as a trusted belief. But we might have to think about how to get to that gift shop somebody just told us about. Of course, as we grow there are ever fewer situations that our beliefs don't cover - so some older folks can seem to be "set in their ways".
In a forum like this (which is about beliefs) we constantly face challenges to our beliefs from opponents who are using their intellect to trip us up - to present us with novel problems that we don't recognize or for which we don't have well rehearsed beliefs that we've worked out before. So, in I/P we engage our intellects continuously and often in high gear to deal with this set of unique problems centered on justifying our existing beliefs.
I/P is like a gym where both sides of the brain can get a thorough work out - although some posters consistently favor one side over the other.But, you are right. In a forum like this it does seem that we are all using our intellects to construct rationalizations for our beliefs - no matter how we arrived at them - because that's what we are being challenged to do. There is very little new belief formation going on here.
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Strong beliefs are very trusted beliefs that over time and through testing in the real world - become part of our identity. We've learned to depend on them for our survival. You could say that we are more likely to use our intellect to justify those strong beliefs than change them. We don't often question our identity - but we are always ready to defend it.
The value of a forum like this - is that others who don't share our strong identity beliefs are more than willing to challenge them for us.
That's not to say any of us are going to change our strong beliefs easily. But, it does happen. And if it does, it will probably be the result of relentless challenges to our beliefs in a place like this - that eventually acquire more emotional strength than our own egos.