Buddhas and Ancestors continuously maintain ocean mudra samadhi. While swimming in this samadhi, they expound, realize, practice. - Dōgen

Dōgen says here that to study Buddhism means to study one’s Self; to learn Buddhism is to learn one’s Self.

There is a simple way to become a buddha: When you refrain from unwholesome actions, are not attached to birth and death, and are compassionate toward all sentient beings, respectful to seniors and kind to juniors, not excluding or desiring anything, with no thoughts or worries, you will be called a buddha. Seek nothing else.

Handle even a single leaf of a green in such a way that it manifests the body of the Buddha. This in turn allows the Buddha to manifests through the leaf. This is a power which you cannot grasp with your rational mind. It operates freely, according to the situation, in a most natural way.