Ritual and Mantras: Rules without Meaning, quoted in An Introduction to Hinduism https://www.google.com/books/edition/An_Introduction_to_Hinduism/KpIWhKnYmF0C?hl=en&gbpv=1&pg=PA12 by Gavin D. Flood, p. 12.
Johan Frederik "Frits" Staal was the department founder and Emeritus Professor of Philosophy and South/Southeast Asian Studies at the University of California, Berkeley. Staal specialized in the study of Vedic ritual and mantras, and the scientific exploration of ritual and mysticism. He was also a scholar of Greek and Indian logic and philosophy and Sanskrit grammar. Wikipedia
Ritual and Mantras: Rules without Meaning, quoted in An Introduction to Hinduism https://www.google.com/books/edition/An_Introduction_to_Hinduism/KpIWhKnYmF0C?hl=en&gbpv=1&pg=PA12 by Gavin D. Flood, p. 12.