The Heart Sutra (Prajnaparamita Hridaya) is just 260 characters but the essence of all Buddhist Prajna texts.
"Avalokiteshvara Bodhisattva, deeply practicing the Prajnaparamita, saw that all five skandhas are empty, and transcended all suffering."
"Form does not differ from emptiness; emptiness does not differ from form. Form itself is emptiness; emptiness itself is form." Not saying the world doesn't exist — rather, all phenomena are impermanent and without fixed essence. Understanding this frees attachment.
"Gate Gate Paragate Parasamgate Bodhi Svaha." Meaning: Gone, gone, gone beyond, all gone beyond, awaken!