Human beings are social animals, and the tenor of our social life is one of the most important influences on our mental health. Without positive, durable relationships, both our minds and our bodies fall apart.
Self-control separates us from our ancient ancestors and the rest of the animal kingdom, thanks to our large prefrontal cortices. Rather than responding to immediate impulses, we can plan, we can evaluate alternative actions, and we can refrain from doing things we'll regret.
Possessing little self-regard can lead people to become depressed, to fall short of their potential, or to tolerate abusive situations and relationships. Too much self-love, on the other hand, results in an off-putting sense of entitlement and an inability to learn from failures.