Why, asks the egoist, should I work for posterity when it has done absolutely nothing for me?
K. Prutkov

A person in love with themselves at least has the advantage that they will never have many rivals.
Georg Christoph Lichtenberg

He who correctly points out my mistakes is my teacher; he who rightly praises my correct actions is my friend; he who flatters me is my enemy.
Xun Tzu

Fear of making a mistake should not deter us from seeking the truth.
Claude Adrien Helvétius