長阿含經 17.p32

17.p32

The Bhagavān then told the monks, “Udraka Rāmaputra made this statement to a large assembly: ‘There is what’s seen and not seen. What is called the seen and not seen? It’s like a knife that can be seen, and a sword that cannot be seen.’ Monks, Rāmaputra made that metaphor with the ignorant words of ordinary people.