The Buddha is said to have set the "wheel of dharma" in motion when he delivered his first sermon, which is described in the "Dhammacakkappavattana Sutta". This "turning of the wheel" signifies a great and revolutionary change with universal consequences, brought about by an exceptional human being. Buddhism adopted the wheel as a symbol from the Indian mythical idea of the ideal king, called a chakravartin ("wheel-turner", or "universal monarch"), who was said to possess several mythical objects, including the "ratana cakka" (the ideal wheel). The "Mahā Sudassana Sutta" of the Digha Nikaya describes this wheel as having a nave (nābhi), thousand spokes (sahassārāni) and a felly (nemi), all of which are perfect in every respect. Siddhartha Gautama was said to have been a "mahapurisa" (great man) who could have chosen to become a wheel turning king, but instead became the spiritual counterpart to such a king, a wheel turning sage, i.e. a Buddha.