John Daido Loori, Roshi is abbot of Zen Mountain Monastery in Mt. Tremper, New York. He is a dharma heir of Taizan Maezumi Roshi.
John Daido Loori, Roshi explains why non-thinking is right thought in this commentary on Dogen's 300 Koan Shobogenzo, Case 129: "Yoashan's Non-Thinking"
The Main Case
When Priest Yaoshan was sitting in meditation1 a monk asked,2
"What do you think about, sitting in steadfast composure?"3
Yaoshan said, "I think not thinking."4
The monk said, "How do you think not thinking?"5
Yaoshan said, "Non-thinking."6