mind's eye, n.All

Mind's eye (n.) grows ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠dull when turned on itself, like eyes that look too earnestly at the setting sun and lose the sight of it entirely.