Klingon philosophy is most notably a warrior's philosophy. A Klingon's moral goal is the achievement of honor, mostly through battle. This is comparable to the Earth-based martial philosophy of such countries as China, India and Japan, although with significant differences. Klingons also have a complex religious philosophy upon which their martial philosophy is based. The most notable contributer to this system was Kahless himself. The Klingon oath of 'sacrifice, strength, duty' displays the three primary qualities that are valued above all else within Klingon warrior society.