So that before the time of civil society, or in the interruption thereof by war, there is nothing can strengthen a covenant of peace agreed on, against the temptations of avarice, ambition, lust, or other strong desire, but the fear of that invisible power, which they everyone worship as God, and fear as a revenger of their perfidy. All therefore that can be done between two men not subject to civil power, is to put one another to swear by the God he feareth, which “swearing,” or “oath,” is “a form of speech, added to a promise; by which he that promiseth, signifieth, that unless he perform, he renounceth the mercy of his God, or calleth to Him for vengeance on himself.” Such was the heathen form, “Let Jupiter kill me else, as I kill this beast.” So is our form, “I shall do thus, and thus, so help me God.” And this, with the rites and ceremonies, which everyone useth in his own religion, that the fear of breaking faith might be the greater.