On another occasion, when I [Annamalai Swami] asked Bhagavan to select some reading material for me, he gave me a short-list of six books: Kaivalya Navanitam, Ribhu Gita, Ashtavakra Gita, Ellam Ondre, Swarupa Saram and Yoga Vasishta.
He laid particular stress on Ellam Ondre, telling me, 'If you want moksha write, read and practice the instructions in Ellam Ondre'.
Source: from Living by The Words of Bhagavan