坐禪三昧經 2.49

2.49

於諸法中智慧淺入，名阿羅漢；中入名辟支佛；深入名佛。如遙見樹，不能分別枝；小近能分別枝，不能分別華、葉；到樹下盡能分別知樹枝、葉、華、實。聲聞能知一切諸行無常，一切諸法無主，唯涅槃善安隱。聲聞能如是觀，不能分別深入深知；辟支佛少能分別，亦不能深入深知；佛知諸法分別究暢，深入深知也。

Among dharmas, shallow entry of wisdom is called an arhat; middling entry is called a pratyekabuddha; deep entry is called a Buddha. It is like seeing a tree from afar and being unable to distinguish the branches; slightly closer, one can distinguish the branches, but cannot distinguish the flowers and leaves; arriving under the tree, one can distinguish and know all the branches, leaves, flowers, and fruits. A śrāvaka can know that all conditioned formations are impermanent, that all dharmas have no master, and that only nirvāṇa is good and secure. A śrāvaka can contemplate in this way, but cannot distinguish with deep entry and deep knowledge; a pratyekabuddha can distinguish a little, but also cannot deeply enter and deeply know; a Buddha knows dharmas with exhaustive clarity, deeply entering and deeply knowing them.