A conscientious scruple against taking an oath, serving as a juror in a capital case, doing military duty, or the like, is au objection or repugnance growing out of the fact that the person believes the thing demanded of him to be morally wrong, his conscience being the sole guide to his decision; it is thus distinguished from an “objection on principle,” which is dictated by the reason and judgment, rather than the moral sense, aud may relate only to the propriety or expediency of the thing in question. People v. Stewart, 7 Cal. 143