Regarding "the roots of prejudice and personal opinion", Rousseau wrote in Emile:
Although the Creator has given this vitality to the children, he has not given them more power to use it so as not to cause harm. However, once the child sees the people around him as a tool to use and relies on the people around him for activities, then they will use these people to satisfy their own desires and make up for their lack of strength.
It won't be long before they will feel how easy it is to act with someone else's hand and to conquer everything with just a single move of their mouth!That's why they become obnoxious, arrogant, rude, and disobedient.
However, the emergence and development of this kind of mentality of governing people is not caused by nature, but is formed after birth. Because it doesn't take long to gain experience, they will realize how pleasant it is to call on someone else's hand to do the work for them, just by moving their mouth.
When children grow up, they gain the strength to stop being as disturbed as before, but to be more in control of themselves. However, the desire to serve others does not disappear with the increase in strength. The psychology of the man who harnesses others evokes and fuels his vanity, which is reinforced by habit, which also leads to some fantasies and strange thoughts. That's when prejudice and personal opinion take root. (*Internet, infringement must be deleted).