[84] That being which is the most beautiful, and the most beneficial to human life, and suitable to rational nature, swears not itself, because truth on every point is so innate within him that his bare word is accounted an oath. Next to not swearing at all, the second best thing is to keep one’s oath; for by the mere fact of swearing at all, the swearer shows that there is some suspicion of his not being trustworthy.