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If to talk to oneself when alone is folly, it must be doubly unwise to listen to oneself in the presence of others.

Baltasar Gracian, Baltasar Gracián y Morales (2004). “The Art of Worldly Wisdom”, p.80, Shambhala Publications
If to talk to oneself when alone is folly, it must be doubly unwise to listen to oneself in the presence of others.