For this corruptible must put on incorruption; and this mortal must put on immortality
1 Corinthians 15:53
Mac has a highly readable and intelligent post about the undecayed bodies of saints (to be fair, I've never known any of her posts which aren't readable and intelligent). This is one of those occcassions when I am instinctively moved to thank God for his gifts of nature and grace. I have never seen a saint's body as incorrupt as St Bernadette's, but last year I was visiting Assisi and was able to see the preserved body of St Clare. St Clare's body showed no signs of decay for a few days after her death, but when they soon appeared, they applied wax to her corpse, and so it has been unchanged for over 700 years. Deo Gratias!