What is "the great doubt" in Buddhism?

Bright on Buddhism Episode 81 - What is "the great doubt" in Buddhism? How does one cultivate it? Why ought one cultivate it? Resources: Berzin, Alexander (2006), Primary Minds and the 51 Mental Factors; Guenther, Herbert V. & Leslie S. Kawamura (1975), Mind in Buddhist Psychology: A Translation of Ye-shes rgyal-mtshan's "The Necklace of Clear Understanding" Dharma Publishing. Kindle Edition.; Kunsang, Erik Pema (translator) (2004). Gateway to Knowledge, Vol. 1. North Atlantic Books.; Nina van Gorkom (2010), Cetasikas, Zolag; https://terebess.hu/zen/great_doubt.pdf; https://tricycle.org/magazine/great-faith-great-doubt-great-determination/; Abe, Masao (1989), Zen and Western Thought, translated by William R. LeFleur, University of Hawaii Press; Abe, Masao; Heine, Steven (1996), Zen and Comparative Studies, University of Hawaii Press; Addiss, Stephen; Loori, John Daido, The Zen Art Book: The Art of Enlightenment; D.T. Suzuki, Essays in Zen Buddhism, First Series (1927), Second Series (1933), Third Series (1934); Lu K'uan Yu (Charles Luk), Ch'an and Zen Teachings, 3 vols (1960, 1971, 1974), The Transmission of the Mind: Outside the Teaching (1974); Paul Reps & Nyogen Senzaki, Zen Flesh, Zen Bones (1957); Philip Kapleau, The Three Pillars of Zen (1966); Shunryu Suzuki, Zen Mind, Beginner's Mind (1970); Katsuki Sekida, Zen Training: Methods & Philosophy (1975); Heine, Steven (2007), "A Critical Survey of Works on Zen since Yampolsky" (PDF), Philosophy East & West, 57 (4): 577–592, doi:10.1353/pew.2007.0047, S2CID 170450246; McRae, John (2004), The Sutra of Queen Śrīmālā of the Lion's Roar and the Vimalakīrti Sutra (PDF), Berkeley, CA: Numata Center for Buddhist Translation and Research, ISBN 1886439311, archived from the original (PDF) on 12 September 2014; Welter, Albert (2000), "Mahakasyapa's smile. Silent Transmission and the Kung-an (Koan) Tradition", in Steven Heine; Dale S. Wright (eds.), The Koan: Texts and Contexts in Zen Buddhism, Oxford: Oxford University Press; Schlütter, Morten (2008), How Zen became Zen. The Dispute over Enlightenment and the Formation of Chan Buddhism in Song-Dynasty China, Honolulu: University of Hawai'i Press, ISBN 978-0-8248-3508-8; Bodiford, William M. (1993), Sōtō Zen in Medieval Japan, University of Hawaii Press, ISBN 0-8248-1482-7 Do you have a question about Buddhism that you'd like us to discuss? Let us know by tweeting to us @BrightBuddhism, emailing us at [email protected], or joining us on our discord server, Hidden Sangha https://discord.gg/tEwcVpu! Credits: Nick Bright: Script, Cover Art, Music, Voice of Hearer, Co-Host Proven Paradox: Editing, mixing and mastering, social media, Voice of Hermit, Co-Host