Our Lord Jesus Christ, born true man without ever ceasing to be true God, began in his person a new creation and by the manner of his birth gave man a spiritual origin. What mind can grasp this mystery, what tongue can fittingly recount this gift of love? Guilt becomes innocence, old becomes new, strangers are adopted and outsiders are made heirs. Rouse yourself, man, and recognise the dignity of your nature. Remember that you were made in God’s image; though corrupted in Adam, that image has been restored in Christ.
Use creatures as they should be used: the earth, the sea, the sky, the air, the springs and rivers. Give praise and glory to their Creator for all that you find beautiful and wonderful in them. See with your bodily eyes the light that shines on earth, but embrace with your whole soul and all your affections the true light which enlightens every man who comes into this world. Speaking of this light the prophet said: Draw close to him and let his light shine upon you and your face will not blush with shame. If we are indeed the temple of God and if the Spirit of God lives in us, then what every believer has within himself is greater than what he admires in the skies.
–from a sermon by Pope St Leo the Great