Buddha-carita, or Life of Buddha by Ven. Aśvaghoṣa

Buddha-carita, or Life of Buddha - 209
51. In the heavens everywhere the heavenly beings with troops of
Apsarases uttered forth great shouts, ‘Even so, O noble being of
boundless energy!’
52. Then Maitreya addressed the holy one, ‘O great mendicant, in
what form has the wheel been turned by thee?’
53. Having heard this question asked by the great-souled Maitreya, the
holy one looked at him and thus addressed him:
54. ‘The profound subtil wheel of the Law, so hard to be seen, has
been turned by me, into which the disputatious Tīrthikas cannot
penetrate.
55. ‘The wheel of the Law has been turned, which has no extension,
no origin, no birth, no home, isolated, and free from matter;
56. ‘Having many divisions, and not being without divisions, having
no cause, and susceptible of no definition, – that wheel, which is
described as possessing perfect equilibrium, has been proclaimed by
the Buddha.
57. ‘Everything subject to successive causation is like a delusion, a
mirage, or a dream like the moon seen in water or an echo, – it lies
stretched out on the surface, not to be extirpated, but not eternal.
58. ‘The wheel of the Law has been described as that in which all
false doctrines are extirpated; it is always like the pure ether,
involving no doubts, ever bright.