Nichiren, a prominent figure in Japanese Buddhism, founded his school on the profound assertion that the chanting of 'Namu Myōhō Renge Kyō' represents the essence of the Buddha's teachings as contained in the Lotus Sutra. This statement was made in 1253, marking a significant pivot within Japanese Buddhism. The Lotus Sutra is considered one of the most important texts in Mahayana Buddhism, emphasizing the concept of universal enlightenment and the belief that all sentient beings possess the potential to attain Buddhahood. Nichiren's declaration was not only a personal revelation but also set forth a new path for his followers, advocating for a practice that emphasized active devotion to this mantra while rejecting other schools of thought that he believed deviated from the true teachings of the Buddha.

The backdrop of this declaration was marked by a turbulent society in Japan, where various Buddhist sects vied for authority and influence. Nichiren faced substantial opposition and persecution from both religious leaders and political figures who viewed his teachings as a threat to established structures. Nevertheless, his bold proclamation formed the bedrock of Nichiren Buddhism, promoting exclusive reliance on the Lotus Sutra, which he believed contained the ultimate truth necessary for overcoming the challenges of life. His teachings resonated with many followers, ultimately giving rise to a distinct religious movement that would endure through the centuries.

Following his declaration, Nichiren's followers began to disseminate his teachings, establishing temples and communities based on his principles. The chant 'Namu Myōhō Renge Kyō' became a central practice in the lives of his adherents, forming a focal point for meditation and community gatherings. Nichiren's legacy continues to influence various sects within Buddhism today, demonstrating the lasting impact of his singular vision of faith and practice.