Extremely famous Jain holy text written in Sanskrit in perhaps the fifth century CE. Śvetāmbaras call the author Umāsvāti while Digambaras know him as Umāsvāmin. Going into the principles of karma in ten chapters, it discusses the principles and the reality of existence in a concise style – sūtra. The Tattvārtha-sūtra is a key text, fundamental to all Jain sects. Its title is often translated into English as That Which Is.