There’s a world of difference between a strong ego, which is essential, and a large ego — which can be destructive. The guy with a strong ego knows his own strengths. He’s confident. He has a realistic idea of what he can accomplish, and he moves purposefully toward his goal. But the guy with a large ego is always looking for recognition. He constantly needs to be patted on the back. He thinks he’s a cut above everybody else. And he talks down to the people who work for him.

As a rule, an individual is egotistic in the proportion that he lacks intelligence. The same is true of nations and races. The barbarian is egotistic enough to suppose that an Infinite Being is constantly doing something, or failing to do something, on his account. But as man rises in the scale of civilization, as he becomes really great, he comes to the conclusion that nothing in Nature happens on his account—that he is hardly great enough to disturb the motions of the planets.

The egotist is all surface; underneath is a pulpy mess and a lot of self-doubt. But the egoist may be yielding and even deferential in things he doesn't consider important; in anything that touches his core he is remorseless.

it is not just the frequency with which "I" occurs, but the general spirit of a person's work that shows to what extent he is afflicted by the besetting sin of "egotism." And anyway, wasn't it something of a feat to keep a grip on one's own personality and a true sense of identity in our era of wholesale slaughter and death camps on such a vast scale? Times such as these breed only individualism based on the principle "every man for himself," not a true sense of one's own worth. The loss of this sense is not something our age can be proud of, but a sign of its sickness. I know the symptoms from observing myself and those around me.

Egoism in its narrowest sense is a tautology, not a tactic. Adolescents of all ages who triumphantly trumpet that "everyone is selfish," as if they’d made a factual discovery about the world, only show that they literally don’t know what they’re talking about. Practical egoism must be something more, it must tell the egoist something useful about himself and other selves which will make a difference in his life (and, as it happens, theirs). My want, needs, desires, whims — call them what you will — extend the ego, which is my-self purposively acting, out where the other selves await me. If I deal with them, as the economists say, "at arm’s length," I can’t get as close as I need to for so much of what I want. At any rate, no "spook," no ideology is going to get in my way. Do you have ideas, or do ideas have you?

Egotist, n. A person of low taste, more interested in himself than in me.

To have ego means to believe in your own strength. And to also be open to other people's views. It is to be open, not closed. So, yes, my ego is big, but it's also very small in some areas. My ego is responsible for my doing what I do — bad or good.

Of course I'm an egoist. Where do you get if you aren't?

How subtle is egotism. It builds the dictators. It makes the materialist say that we are alone in the system and the highest form of life in the universe. Where does it spring from? Where else but from a hidden inferiority complex inherent within those who are incapable of lasting accomplishment.

Man is too thoroughly an egoist not to be also an egotist; if he love, the object shall know it. During a lifetime he may conceal it through stress of expediency and honour, but it shall bubble from his dying lips, though it disrupt a neighbourhood. It is known, however, that most men do not wait so long to disclose their passion. In the case of Lorison, his particular ethics positively forbade him to declare his sentiments, but he must needs dally with the subject, and woo by innuendo at least.

Egoism is preference for self, partiality toward that part of the universe bounded by one's own skin. It may consist simply of regard for self, but with regard for self is usually associated enmity toward others. Egoism manifests itself in such qualities of mind as selfishness, cruelty, intolerance, hate, hardheartedness, savagery, rudeness, injustice, narrowness, and the like. It is the primal impulse of the living heart. Enmity is older and more universal than love. Enmity constituted the very loins from which long ago came the original miscreants of this world.

Am I what they call an egoist? Or am I the opposite, a man of excessively weak spirit? I really don't know myself, but since I seem in either case to be a mass of vices, I drop steadily, inevitably, into unhappiness, and I have no specific plan to stave off my descent.

The hallmark of egotistical love, even when it masquerades as altruistic
love, is the negative answer to the question ‘Do I want my
love to be happy more than I want him to be with me?’ As soon as
we find ourselves working at being indispensable, rigging up a
pattern of vulnerability in our loved ones, we ought to know that
our love has taken the socially sanctioned form of egotism. Every
wife who slaves to keep herself pretty, to cook her husband’s favourite
meals, to build up his pride and confidence in himself at the expense
of his sense of reality, to be his closest and effectively his only
friend, to encourage him to reject the consensus of opinion and find
reassurance only in her arms is binding her mate to her with hoops
of steel that will strangle them both. Every time a woman makes
herself laugh at her husband’s often-told jokes she betrays him. The man who looks
at his woman and says ‘What would I do without you?’ is already
destroyed. His woman’s victory is complete, but it is Pyrrhic. Both
of them have sacrificed so much of what initially made them lovable
to promote the symbiosis of mutual dependence that they scarcely
make up one human being between them.

The question is, just how do we tackle this problem? Do we merely modulate your Ego so it's less irritating? Admittedly, that might make you easier to take – but it won't address the real core of the problem, which is that when all is said and done you really don't have a lot to be egotistical about."
"That can't be true! My Haiku alone –"
"First rule of human social interaction, Mr. Porter: If you have to lead with Haiku, you've already lost.