Call often to mind that proverb, “That the eye is not satisfied with seeing, nor the ear filled with hearing” (Ecclesiastes 1:8). Endeavor therefore to withdraw thy heart from the love of visible things, and to turn thyself to the invisible. For they that follow their sensuality, do stain their own consciences, and lose the favour of God.
– Thomas a Kempis –
from The Imitation of Christ