After this perception [ie. using the eyes to see the world] the mind, by exercising its rational thought, can wonder at the order, the size, the beauty, the light, and all the other attributes of the sky. And in all of these, the contemplative man can see the wisdom, the creativity, the power, and the beauty of him who created it. He can thus reason and so: If the sky which is created is so beautiful, so full of light, how much more beautiful and more luminous is the Creator of the sky? On this point St. Dionysius said: "For essentially the effects are present, standing clearly before their causes." And so the mind climbs as high as it possibly can to the knowledge of the Creator, and with this knowledge the mind excites the heart and the will to love this Creator.
St. Basil encourages us to think such thoughts and through them to rise from the visible to the invisible and from the ephemeral to the eternal. He wrote: "If these ephemeral things are so wonderful, how much more are the eternal? And if the visible are so good, how much more good are the invisible? If the magnitude of heaven goes beyond the ability of human reason to measure, which mind can discern the nature of the divine things? If the physical sun that is subject to corruption is so beneficial, so great, so quick to move and establish the oderly seasons, and if one does not tire of looking upon it, how much more beautiful is the Sun of Righteousness? And if it is a loss even for a blind man not to see the sun, how much greater is the loss for the sinner who is deprived of the true light?"
-- St. Nicodemus of the Holy Mountain, A Handbook of Spiritual Counsel