The Long Āgama Sūtra 28.15

28.15

佛言：「諸想、諸言無想，於其中間能次第得想知滅定者，是為第一無上想。」

The Buddha said, “The conception that knows the attainment of cessation, which is attained in a sequence from ‘having conception’ to ‘having no conception,’ is the supremely unsurpassed conception.”