Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity.
— Martin Luther King, Jr.

A conscientious man would be cautious how he dealt in blood.
Edmund Burke conscientious quote

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Depend on no man, on no friend but him who can depend on himself. He only who acts conscientiously toward himself, will act so toward others.
— Johann Kaspar Lavater

An intelligent and conscientious opposition is a part of loyalty to country.
— Bainbridge Colby

War will exist until that distant day when the conscientious objector enjoys the same reputation and prestige that the warrior does today.
— conscientious quotation by John F. Kennedy