A voice says, “Cry out.”
And I said, “What shall I cry?”
“All people are like grass, and all their faithfulness is like the flowers of the field.  The grass withers and the flowers fall, because the breath of the Lord blows on them.  Surely the people are grass.  The grass withers and the flowers fall, but the word of our God endures forever.”
Isaiah 40:6-8 New International Version (NIV)