"st" may be referring to the following story about the 9th century Ch'an master Tung-shan:
When Tung-shan was leaving Yun-yen he said, "In the future, when you are gone and people ask me about your teachings, what shall I say?" Yun-yen pauses imperceptibly and then softly says, "Just this. Just this." At this moment, the successor hesitates. The old sage perceives it and warmly encourages Tung-shan. "You must be extremely careful and thorough in realizing just this."
Traveling on foot through green mountains, pondering just this, Buddha Tung-shan, while wading across a stream, suddenly perceives the reflection of his own face in the swiftly flowing water. His subtle hesitation evaporates and he is now prepared to accomplish the transmission of light. He sings in quiet ecstasy, "Why seek mind somewhere else? Wandering freely, I meet my own true nature everywhere, through all phenomena. I cannot become it for it is already me."
A similar story is found in Zen and the heart of psychotherapy By Robert Rosenbaum, p.222 (the spelling is different, Tozen and Ungan)
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