One’s affirmative responsibilities are all conditioned by circumstances, and mostly are (conditional) implications of the Golden Rule of doing to or for others what you would wish them to do to or for you. For both these reasons, one cannot make sound judgments about what one should be doing – that is, about what is the “mean” of reasonableness – unless one’s wishes are those of a person who understands the opportunities and the circumstances well, and whose concerns and intentions are those of