Dr. Khalid Sohail In Search of Wisdom (Subject: The Gathas of Zarathushtra) In Search of Wisdom with Dr. Khalid Sohail and Dr. Baland Iqbal May 26, 2018 The Gathas are 17 Avestan hymns believed to have been composed by Zarathusthra (Zoroaster). They form the core of the Zoroastrian liturgy. A discussion between Dr. Khalid Sohail and Dr. Baland Iqbal.