What is the origin of beside myself?

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It means experiencing extreme joy. "Beside" was formerly (15th through 19th centuries) used in phrases to mean "out of a mental state or condition, as 'beside one's patience, one's gravity, one's wits'" (Oxford Engl. Dict.), and that use survives only in "'beside oneself': out of one's wits, out of one's senses."

"Beside himself. Why do we describe a distraught person as being 'beside himself'? Because the ancients believed that soul and body could part and that under great emotional stress the soul would actually leave the body. When this happened a person was 'beside himself.' This same thought is to be found in 'out of his mind'; and in 'estasy' too. 'Ecstasy' is from the Greek and literally means 'to stand out of.'" From "Dictionary of Word Origins" by Jordan Almond (Carol Publishing Group, Secaucus, N.J., 1998).

Source: The Phrase Finder
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How did Adage I'm beside myself originate?

Similar to "I'm out of my mind". Originally came from a phrase used in the Bible, in 2 Corinthians 5:13 - "For if we are beside ourselves, it is for God; if we are of sound mi

Who sang All by Myself originally?

Eric Carmen in 1976. Eric Carmen also had chart success with "Hungry Eyes"(Dirty Dancing) "Let's Go All the Way", "Never gonna Fall In Love Again" and "Make me Lose Control".

Can beside myself be used in a sentence?

(The idiomatic phrase "to be beside oneself" means to be anxious, upset or disturbed.) "After my dog wandered off, I was beside myself with worry."