sentences:  Acharya Bhadrabahu of the 4th century BCE practiced deep "Mahaprana" meditation for twelve years.Kundakunda of 1st century BCE, opened new dimensions of meditation in Jain tradition through his books such as "Samayasāra" and "Pravachansar".The 8th century Jain philosopher Haribhadra also contributed to the development of Jain yoga through his Yogadṛṣṭisamuccaya, which compares and analyzes various systems of yoga, including Hindu, Buddhist and Jain systems.