I would like to talk a bit more about Jijuyu zanmai, "the samadhi, the

still abiding taste of the self in self-fulfillment"  ...

Uchiyama Roshi's translation is that one "disports oneself freely in this Samadhi", which seems to convey that so nicely.

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ALL BUDDHA-TATHAGATAS TOGETHERhave been simply transmitting wondrous dharma and actualizing anuttara samjaksambodhi [supreme perfect enlightenment] for which there is an unsurpassable,unfabricated, wondrous method. This wondrous dharma, which has been transmittedonly from buddha to buddha without deviation, has as its criterion jijuyuzanmai. For disporting oneself freely in this samadhi, practicing zazen in anupright posture is the true gate.

From: Talk on the Wholehearted Practice of the Way -Kosho Uchiyama (with Shohaku Okumura, Taigen Daniel Leighton)

When the buddha-tathagatas each having received theone-to-one transmission of the splendid Dharma, experience the supreme state ofbodhi, they possess a subtle method that is supreme and without intention. Thereason this [method] is transmitted only from buddha to buddha, without deviation,is that the samadhi of receiving and using the self is its standard. Forenjoyment of this samadhi the practice of [Za]zen in the erect sitting posture,has been established as the authentic gate. From: Bendowa - A Talk about Pursuing the Truth  - Nishijima-Cross