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A person who can write a long letter with ease, cannot write ill.

Jane Austen (2006). “Illustrated Jane Austen - 8 Books in 1. Illustrated by Hugh Thomson. Sense & Sensibility, Pride & Prejudice, Mansfield Park, Emma, Northanger Abbey, P”, p.157, Shoes & Ships & Sealing Wax
A person who can write a long letter with ease, cannot write ill.