Insincerity is always weakness; sincerity even in error is strength.
GEORGE HENRY LEWES, The Principles of Success in Literature
The great enemy of clear language is insincerity. When there is a gap between one’s real and one’s declared aims, one turns, as it were, instinctively to long words and exhausted idioms, like a cuttlefish squirting out ink.
GEORGE ORWELL, The Lion and the Unicorn
Sincerity is an openness of heart; we find it in very few people; what we usually see is only an artful dissimulation to win the confidence of others.
LA ROCHEFOUCAULD, Reflections