Bodhidharma said:

“There is no dharma outside the mind, and there is no mind outside the dharma.”
Explanation:
There is no dharma outside the mind: The mind here is the enlightened essence, the pure true mind. “Dharma” is all phenomena, things, and ideas in the world. This sentence means that all understanding and perception of the world arise from the mind. Without the mind, all dharmas become meaningless and have no real form.
There is no mind outside the dharma: All enlightenment or perception can only exist when there are dharmas. In other words, interacting with the world and experiencing life is the means to realize the truth. In short:
This saying wants to point out the inseparability between the mind and the dharma, between the observer and the observed object. The distinction is just an illusion of the mind; when one sees through this, one will attain enlightenment and be free from all bondage.