Tattvārthasūtra, meaning "On the Nature [artha] of Reality [tattva]" (also known as Tattvarth-adhigama-sutra or Moksha-shastra) is an ancient Jain text written by Acharya Umaswami in Sanskrit, sometime between the 2nd- and 5th-century CE.
The Tattvārthasūtra is regarded as one of the earliest, most authoritative texts in Jainism. It is accepted as authoritative in both its major sub-traditions – Digambara and Śvētāmbara – as well as the minor sub-traditions. It is a philosophical text, and its importance in Jainism is comparable with that of the Brahma Sutras and Yoga Sutras of Patanjali in Hinduism. In an aphoristic sutra style of ancient Indian texts, it presents the complete Jainism philosophy in 350 sutras over 10 chapters. The text has attracted numerous commentaries, translations and interpretations since the 5th-century.
One of its sutras, Parasparopagraho Jivanam is the motto of Jainism. Its meaning is interpreted as "(The function) of souls is to help one another", or "Souls render service to one another".
Tattvartha Sutra is also known in Jainism as the Moksha-shastra (Scripture describing the path of liberation).
The text written in Sanskrit, begins with an invocation:I bow to the Lord, the promulgator of the path to liberation, the destroyer of mountains of karmas and the knower of the whole of reality, so that I may realize these qualities.
The first verse of Tattvārthsūtra, "सम्यग्दर्शनज्ञानचारित्राणि मोक्षमार्ग:" summarizes the Jaina path to liberation. It means that the Ratnatraya (three jewels: right view, right knowledge and right conduct) collectively constitutes the path to liberation or moksha.
Its ten chapters are:
Faith and Knowledge
The Category of the Living
The Lower World and the Middle World
The Celestial Beings
The Category of the Non-Living
Influx of Karma
The Five Vows
Bondage of Karma
Stoppage and Shedding of Karma
Liberation
The first chapter deals with the process of cognition and details about different types of knowledge. The next three chapters deal with the Jīva (soul), lower worlds, naraka, and celestial abodes, devas.