Noun
The quality or state of being sound; as, the soundness of timber, of fruit, of the teeth, etc.; the soundness of reasoning or argument; soundness of faith.
Source: Webster's dictionaryFrom the preponderance of talent, we may always infer the soundness and vigour of the commonwealth; but from the preponderance of riches, its dotage and degeneration. Charles Caleb Colton
Not only our future economic soundness but the very soundness of our democratic institutions depends on the determination of our government to give employment to idle men. Franklin D. Roosevelt
When it comes to consideration of how to do well in running the city, which must proceed entirely through justice and soundness of mind. Protagoras
The important thing isn't the soundness or otherwise of the argument, but for it to make you think. Albert Camus
Consider the attitude our great Vasile Conta held in the Chamber in 1879. Fifty years earlier the Romanian philosopher demonstrated with unshakeable scientific arguments, framed in a system of impeccable logic, the soundness of racial truths that must lie at the foundation of the national state... Corneliu Zelea Codreanu
The strength of the heart comes from the soundness of the faith. Arabic Proverb