Philosophy
Since taekwondo developed in several different kwans, there are several different expressions of taekwondo philosophy. For example, the tenets of the ITF is said to be summed up by the last two phrases in the ITF Student Oath: "I shall be a champion of justice and freedom," "I shall build a better and peaceful world". Alternatively, the Kukkiwon philosophy, the Han Philiosophy, is based on Eastern principles of samje (삼제, three elements), eum (음, yin; negative or darkness) and yang (양, positive or brightness) with samjae referring to cheon (천, sky or heaven), ji (지, the earth), and in (인, a man or a person). The origins of these concepts originate from the Chinese classic "Book of Changes" which is considered to be one of the main canons of East Asian Philosophy.