Sosan, also known as the Third Zen Patriarch, was a Chinese Zen teacher who lived in the 6th century. His teachings have had a significant impact on modern Zen practice and continue to be relevant today.

One of the key teachings of Sosan is the concept of "no-mind" or "empty mind." This refers to a state of mind that is free from thoughts, judgments, and attachments. In modern Zen practice, this teaching is often used to encourage practitioners to let go of their ego and to be fully present in the moment. This can lead to a deeper understanding of the true nature of reality and a sense of inner peace.

Sosan also emphasized the importance of meditation in Zen practice. He believed that through meditation, one could attain a direct experience of enlightenment. This emphasis on meditation is still a central aspect of modern Zen practice, with many practitioners dedicating hours each day to sitting in silent meditation.

Another significant teaching of Sosan is the concept of "non-duality." This refers to the idea that all things are interconnected and ultimately one. This teaching is often used in modern Zen practice to help practitioners see beyond the illusion of separation and to cultivate a sense of compassion and interconnectedness with all beings.

Sosan's teachings also emphasize the importance of self-inquiry and questioning. He encouraged his students to question their own beliefs and perceptions in order to gain a deeper understanding of themselves and the world around them. This aspect of his teachings is still relevant in modern Zen practice, as practitioners are encouraged to constantly question and examine their own thoughts and beliefs.

Additionally, Sosan's teachings on the impermanence of all things and the concept of "no-self" have also had a significant impact on modern Zen practice. These teachings remind practitioners to let go of attachments and to embrace the transience of life. This can lead to a greater sense of acceptance and peace in the face of life's inevitable changes.

In conclusion, Sosan's teachings have had a profound impact on modern Zen practice. His emphasis on no-mind, meditation, non-duality, self-inquiry, and impermanence continue to guide and inspire Zen practitioners today. By incorporating these teachings into their practice, modern Zen practitioners can cultivate a deeper understanding of themselves and the world around them, leading to a more peaceful and fulfilling life.