"Remember thou art dust, and to dust thou shalt return." Gen 3:19.
"A voice says, 'Cry!' And I said, 'What shall I cry?' All flesh is grass, and all its beauty is like the flower of the field. The grass withers, the flower fades when the breath of the Lord blows on it; surely the people are grass. The grass withers, the flower fades, but the word of our God will stand forever." Isaiah 40:6-8.
The image is Georges de la Tour's "Magdalene at the Mirror."