The overall and first goal of the thesis is about finding if possible, a true (most) general ground of morality basically relying on impartial arguments independent of time (history), culture and personal values and interest. The belief is that morality will acquire more convincing authority if its narrative could rely upon such a ground. Philosophically diverse approaches has been done before, especially by using the hypothetical conception of a 'veil of ignorance', a method to assure an impartial position. Impartiality is needed for the fair selection or development of principles of morality. David Hume (judicious spectator) and Adam Smith (impartial spectator) are classic examples who used the impartial position for their moral theories. A more modern version of the veil is Rawls' impartial position as a first starting point to envisage a just society. Impartial arguments however will gain stronger authority when based not alone on hypothetical, but also on empirical grounds. I fully realize that a true impartial and thus 'universal' or 'most general' property of morality, but based on empirical grounds, not on hypothetical grounds is hard to find.