For if we permit the vanity or the presumption of sophistry to determine the least thing theoretically (in a way that extends our knowledge) in respect of what lies beyond the world of sense, or if we allow any pretence to be made of insight into the being and constitution of the nature of God, of His Understanding and Will, of the laws of both and of His properties which thus affect the world, I should like to know where and at what point we will bound these assumptions of Reason. For wherever such insight can be derived, there may yet more be expected (if we only strain our reflection, as we have a mind to do). Bounds must then be put to such claims according to a certain principle, and not merely because we find that all attempts of the sort have hitherto failed, for that proves nothing against the possibility of a better result.