Under one kind of expression he includes the whole of a righteous life, when he says, They shall not speak falsely, nor will there be found a deceitful tongue. It is indeed sufficient for the practice of piety or integrity of life to keep the tongue free from frauds and falsehood; but as it cannot be that any one will abstain from all frauds and falsehood, except he purely and from the heart fears God, the Prophet, by including the whole under one thing, expresses under the word tongue what embraces complete holiness of life.