分別功德論 4.39

4.39

所以稱一心比丘三昧第一者，此比丘昔曾習定，研麁至精，今定功既立，行若遊塵，坐而忘想、忘想理足。其喻如何？猶如有人食百味食，意以飽滿更無食想。雖復行步進止，蓋感而後應，白而後動耳。依定立字，故曰坐起行步入三昧第一也。

The reason why Bhikṣu Ekacitta was praised as foremost in samādhi is that this bhikṣu had practiced concentration in the past, refining it from coarse to exquisite. Now, his mastery of concentration being established, in walking he was like floating dust, and in sitting he forgot conceptual thought, with the principle of forgotten thoughts fully realized. What is the analogy? It is like someone who eats food of a hundred flavours; his mind being full and satisfied, he has no further thought of food. Even though he walks, advances, and stops, it is merely responding after being stimulated, moving only after an impulse. His name was established in reliance on concentration; hence he was called foremost in entering samādhi while sitting, rising, and walking.