Bankei Yotaku was a renowned Japanese Zen master who lived during the 17th century. He is known for his unique teachings and approach to Zen Buddhism, which emphasized the importance of spontaneous enlightenment and the innate Buddha nature within all beings.

One of the key teachings of Bankei Yotaku was the concept of "Unborn Mind." He believed that all beings are inherently enlightened and that the true nature of the mind is pure and unchanging. According to Bankei, this "Unborn Mind" is constantly present and does not need to be attained through meditation or other spiritual practices.

Bankei also emphasized the importance of "Just Sitting" or zazen, a form of meditation where one simply sits and observes the mind without trying to control or manipulate it. He believed that through this practice, one can come to a deep understanding of the true nature of the mind and experience spontaneous enlightenment.

In addition to his teachings, Bankei was also known for his unconventional methods of teaching and his ability to connect with people from all walks of life. He often used simple and relatable language to convey complex Zen concepts, making his teachings accessible to everyone.

Bankei's teachings had a significant impact on the development of Zen Buddhism in Japan. His emphasis on the inherent Buddha nature within all beings and the importance of spontaneous enlightenment challenged traditional Zen practices that focused on strict discipline and attainment through meditation.

Today, Bankei Yotaku is remembered as a compassionate and enlightened teacher who helped many people find peace and understanding through his teachings. His legacy continues to inspire and influence practitioners of Zen Buddhism around the world.