Self-love is the love of oneself.
In 1956 psychologist and social philosopher Erich Fromm proposed that loving oneself is different from being arrogant, conceited or egocentric. He proposed that loving oneself means caring about oneself, taking responsibility for oneself, respecting oneself, and knowing oneself (e.g. being realistic and honest about one's strengths and weaknesses). He proposed, further, that in order to be able to truly love another person, a person needs first to love oneself in this way.
Thomas Aquinas argues that self-love is akin to the capital vice pride, which he holds as "the beginning of all sin." According to Aquinas, "every sin consists in the desire for some mutable good, for which man has an inordinate desire, and the possession of which gives him inordinate pleasure."
Moreover, Aquinas holds "respect of persons" as a sin, as "a just judge regards causes, not persons."
See also 
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