Pure in intention and motive; sincere and free from deceit or malice; mentally and morally pure.
From 'clean' + 'hearted,' parallel to 'cleanhanded' but focusing on internal purity. The heart has symbolized sincerity and true emotion since ancient times across many languages.
In medieval Christian writing, being 'cleanhearted' was literally considered a spiritual achievement—monks practiced meditation and confession specifically to achieve and maintain this inner cleanness!
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