(this is an excerpts from Prajnaparamita Heart Sutra, where Avalokiteshvara talks to Sariputra about the nature of form and formlessness, about buddhahood)
O Shariputra, a son or daughter of noble family who wishes to practice the profound prajnaparamita should see in this way: seeing the five skandhas to be empty of nature. Form is emptiness; emptiness also is form. Emptiness is no other than form; form is no other than emptiness. In the same way, feeling, perception, formation, and consciousness are emptiness.
Thus, Shariputra, all dharmas are emptiness. There are no characteristics. There is no birth and no cessation. There is no impurity and no purity. There is no decrease and no increase. Therefore, Shariputra, in emptiness, there is no form, no feeling, no perception, no formation, no consciousness; no eye, no ear, no nose, no tongue, no body, no mind; no appearance, no sound, no smell, no taste, no touch, no dharmas, no eye dhatu up to no mind dhatu, no dhatu of dharmas, no mind consciousness dhatu; no ignorance, no end of ignorance up to no old age and death, no end of old age and death; no suffering, no origin of suffering, no cessation of suffering, no path, no wisdom, no attainment, and no non-attainment.
Therefore, Shariputra, since the bodhisattvas have no attainment, they abide by means of prajnaparamita.
Since there is no obscuration of mind, there is no fear. They transcend falsity and attain complete nirvana. All the buddhas of the three times, by means of prajnaparamita, fully awaken to unsurpassable, true, complete enlightenment. Therefore, the great mantra of prajnaparamita, the mantra of great insight, the unsurpassed mantra, the unequaled mantra, the mantra that calms all suffering, should be known as truth, since there is no deception. The prajnaparamita mantra is said in this way:
Lotus Sutra 