The Tao Te Ching, a foundational text for Taoism, indirectly touches on concepts related to emotional states in its second chapter. It discusses the interplay of opposites and the concept of duality, such as beauty and ugliness, good and bad, suggesting these qualities define and balance each other. This chapter, while not explicitly about emotions, implies that understanding and accepting the full spectrum of human emotions can lead to inner peace and harmony.
By recognizing the unity and interdependence of all things, including emotional experiences, the Tao Te Ching guides individuals towards living in harmony with the Tao, or the Way. This ancient wisdom encourages a balanced emotional life, mitigating extreme disturbances through the principles of effortless action (wu wei) and simplicity.