Lack of humility is due to nothing else than lack of knowledge. A penetrating, comprehensive knowledge of man in his connection with the events of the world and of history will certainly not lead to excessive self-esteem; far rather it will lead the human being to look at himself objectively. It is precisely when a man does not know himself that there rise up in him those feelings which have their source in the unknown regions of his being. Instinctive, emotional impulses make themselves felt. And it is these instinctive, emotional impulses, rooted as they are in the subconscious, that make for arrogance and pride.
Source: Rudolf Steiner – GA 236 – Karmic Relationships: Esoteric Studies – Volume II – Dornach, 23rd April 1924
Translated by G. Adams, M. Cotterell, C. Davy, & D. S. Osmond