Note 80:1 — PART II. Greek Dualism.
Reading edition
He (Al-Birūnī) quotes with approval the following, as the teaching of the adherents of Aryabhatta: It is enough for us to know that which is lighted up by the sun's rays. Whatever lies beyond, though it should be of immeasurable extent, we cannot make use of; for what the sunbeam does not reach, the senses do not perceive, and what the senses do not perceive we cannot know. From this we gather what Al-Birūnī's Philosophy was: only sense-perceptions, knit together by a logical intelligence, yield sure knowledge. (Boer's Philosophy in Islām, p. 146).