Mental tranquility; freedom from anxiety, worry, or mental disturbance; a state of calm assurance.
Often confused with 'peace of mind,' this phrase actually derives from the idea of giving someone 'a piece of one's mind' (harsh criticism). However, when used positively, it evolved in the 18th century to mean a portion or share of mental calm, treating tranquility as something that can be parceled out.
This phrase is frequently misspelled as 'peace of mind,' creating an interesting linguistic evolution where two similar expressions have merged in popular usage. The original 'piece' version suggests that mental calm comes in discrete portions, while 'peace' implies a more holistic state - both interpretations capture different aspects of psychological well-being.
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