“Buddhas and Ancestors continuously maintain ocean mudra samadhi. While swimming in this samadhi, they expound, realize, practice.”
Ocean Mudra Samadhi (1242)
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Dogen 34
Japanese Zen buddhist teacher 1200–1253Related quotes

The Yoga Sutras of Patanjali, Book III, 2013
Context: Samyama, which is the application of concentration (dharana), meditation (dhyana), and superconscious trance (samadhi) in lightning succession, is practiced with the intent to gain specific knowledge of the object of concentration. The object is seen from all sides, in all its aspects, with full depth and breadth. As such, this complete absorption of the mind using the process of samyama brings complete and specific knowledge of the object. This power of knowing is vibhuti. (Bk. III, Sutra 4, p.7)

"Shoaku makusa : Not Doing Wrong Action" http://wwzc.org/dharma-text/shoaku-makusa-not-doing-wrong-action as translated by Anzan Hoshin roshi and Yasuda Joshu Dainen roshi (2007)

Source: Strength in What Remains: A Journey of Remembrance and Forgiveness

“He who constantly swims in the ocean loves dry land.”
Letter to E.M. Shavrova (September 16, 1891)
Letters