“The idea of Oneness or underlying unity is first expressed in the Daode jing, where the Dao is linked immediately with the One, which it brings forth directly. The One is “the Great Beginning (Zhuangzi 12) and the unified state of creation.”—Livia Kohn.
“In human beings the One is present as primordial qi or cosmic vital energy, the power that makes people come to life and be what they are. Conserving and guarding this cosmic power leads to immortality.”—Livia Kohn.
Nice and simple idea expressed nicely in simplicity. Nothing to add but a cup of green tea.