mind's eye

grows dull when turned on itself, like eyes that look too earnestly at the setting sun and lose the sight of it entirely.

Recast in definition form from: “unless it happens to us who think with care and anxiety about the soul (as is often the case with those who look earnestly at the setting sun), to lose the sight of it entirely; and so the mind’s eye, viewing itself, sometimes grows dull, and for that reason we become remiss in our contemplation.”

mind's eye, n.Definitions

mind's eye