One of the more influential Muslim thinkers of the first half of the 20th century, Iqbal expressed views on the the Bábí and Bahá'í religions in his dissertation "The Development of Metaphysics in Persia" and his poetical magnum opus the Javidnama.
Notes:
Scholarly paper presented at the "Bahá’í Faith and Islam" symposium held at McGill University, Montreal, March 1984.