Eihei Dogen, also known as Dogen Zenji, was a 13th century Japanese monk who is revered as the founder of Soto Zen in Japan. His teachings were deeply rooted in traditional Buddhist principles, but he also brought his own unique interpretations and insights to these teachings.

One of the main ways in which Dogen's teachings incorporated traditional Buddhist principles was through his emphasis on zazen, or seated meditation. This practice, which is central to all forms of Zen Buddhism, involves sitting in a specific posture and focusing on the breath. Dogen believed that through zazen, one could attain a state of "samadhi," or deep concentration, which would ultimately lead to enlightenment.

In addition to zazen, Dogen also emphasized the importance of "shikantaza," or "just sitting." This is a form of meditation in which one simply sits and observes the present moment without trying to achieve any particular goal or attain any specific state of mind. This practice aligns with the traditional Buddhist principle of "non-attachment," as it encourages practitioners to let go of any expectations or desires.

Another key aspect of Dogen's teachings that incorporated traditional Buddhist principles was his emphasis on the concept of impermanence. This is the idea that all things are constantly changing and nothing is permanent. Dogen believed that by truly understanding and accepting impermanence, one could free themselves from suffering and find peace in the present moment. This aligns with the Buddhist principle of "anicca," or impermanence, which is one of the three marks of existence.

Dogen also incorporated the Buddhist concept of "emptiness" into his teachings. This refers to the idea that all things are fundamentally empty of inherent existence and that our perceptions and attachments create a false sense of self and reality. Dogen believed that through zazen and other practices, one could come to understand the true nature of emptiness and break free from the cycle of suffering.

Finally, Dogen's teachings also emphasized the importance of compassion and ethical conduct, which are fundamental principles in Buddhism. He believed that true enlightenment could only be attained through the cultivation of compassion and the practice of ethical behavior. This aligns with the Buddhist principle of "karuna," or compassion, and the Eightfold Path, which outlines the ethical guidelines for living a moral and virtuous life.

In conclusion, Eihei Dogen's teachings incorporated traditional Buddhist principles in various ways, such as through his emphasis on zazen and shikantaza, his teachings on impermanence and emptiness, and his emphasis on compassion and ethical conduct. He brought a fresh perspective and deep understanding to these principles, making his teachings a valuable contribution to the Buddhist tradition.