Humans often have a desire for power, and it sometimes takes over their rational sense, i.e., development of the narcissist. It almost becomes impossible to contradict their beliefs as they live in a world of make-believe where no one but them is right, true, and the best.
Apart from power, life experience also shapes a person’s personality. If we say a person is “so full of himself”, it could mean two different things: 1) overconfidence, and 2) having no confidence.
We can come to understand the cause of narcissism by looking at a person’s childhood. Pampered children who get excessive love, care, and attention may develop this absolute and/or self-obsessed personality of narcissism.
However, what if a child did not receive enough love and attention from their parents? Lack of love or neglect of a child shapes their mindset–to be of survival–where they compensate for this by becoming strongly self-reliant, i.e., the narcissist.