On the Juche Idea (Korean: 주체 사상에 대하여; MR: Chuch'e sasang'e taehayŏ) is a treatise attributed to North Korean leader Kim Jong-il on the North Korean Juche ideology. It is considered the most authoritative work on Juche. The work, although probably ghostwritten for him, legitimized Kim as the sole bona fide interpreter of the ideology. The treatise systemizes Kim Jong-il and his father Kim Il-sung's thought on the Juche philosophy. The treatise marks Juche's departure from the materialism of Marxism–Leninism and posits the consciousness of the massess as dependent on the working class leader.