Final answer:
Santiago's experience in 'The Alchemist' aligns with the Hindu idea of Brahman-Atman, indicating a unity between the individual soul and the universe.
Step-by-step explanation:
When Santiago in "The Alchemist" becomes the wind, his mystical insight most closely aligns with the Hindu understanding of Brahman-Atman. This concept in Hinduism refers to the ultimate reality or world soul (Brahman) and the individual soul (Atman) being one and the same. In becoming the wind, Santiago experiences a unity with the universe that reflects this Hindu concept that the individual soul and the universal are interconnected and essentially identical.