Seeing all Buddhas and hearing their teachings, great bodhisattvas become very joyful: not attached to their own bodies or to the bodies of Buddhas, they understand the body of Buddha is not real or unreal, not existent or nonexistent, not of a particular nature, not without nature, not material, not immaterial, not form, not formless, not born, not extinct, really without existence yet not negating existence. Why? Because it cannot be grasped through any nature or characteristic at all.
Avatamsaka Sutra – 1054