Sight is very powerful. Sight is the first connection made with the Deity. The sight of the murti in the temple inner sanctum stimulates and enhances the flow of uplifting energies, or pranas, within the mind and body. Each Deity performs certain functions, is in charge of certain pranas. Seeing the Deity there unfolds in the mind's eye a like image and prepares the way for deeper blessings and devotion.
-- Satguru Sivaya Subramuniyaswami (1927-2001), founder of Hinduism Today