Tathāgatagarbha thought holds that all sentient beings have the possibility of becoming a tathāgata. It is also called “buddha-nature” thought. It began in the Tathāgatagarbha Sūtra, which teaches that “all sentient beings are the womb of the tathāgata,” and was also preached in the Śrimālādevi Sūtra, [Queen] Śrimālā Sūtra, the Anūnatvāpūrṇatvanirdeśaparivarta Sūtra, Neither Increase Nor Decrease Sūtra, and Mahāparinirvāṇa Sūtra, Great Nirvāṇa Sūtra. The tathāgatagarbha refers to the idea that sentient beings are held within the Tathāgata as fetuses and that they carry within themselves the Tathāgata as a fetus that is tathatā or suchness. This is said to be the cause of them becoming a tathāgata in the future. It is also seen as their innately pure mind, the basis of awakening that gives rise to bodhicitta, equal to the Dharma body of the Tathāgata, and unconditioned suchness.