維摩經略疏 4.31

4.31

羅漢若得超越，名摩訶那伽，心調柔軟，三乘事定齊此為極。身子林中遊此諸禪息諸勞累，以不依佛慧起此諸禪，故呵言不必。所以然者，身子所得非是滿字九種大禪深禪定窟，故言不必。

If an arhat attains transcendence, he is called a mahānāga; his mind is pliable and supple, and the concrete concentrations of the three vehicles reach their ultimate here. Śāriputra roamed in these various dhyānas in the forest to rest from all toil and weariness; because he did not rely on the Buddha's wisdom to generate these various dhyānas, he was rebuked, being told "not necessary." The reason for this is that what Śāriputra attained was not the deep concentration caverns of the nine kinds of great dhyānas of the full-word teaching; hence it is said to be "not necessary."