Quote
"For dust thou art, and unto dust shall thou return."
"When I am dead, the matter which composes my body is indestructible — and eternal, so that come what may to my Soul, my dust will always be going on, each separate atom of me playing its separate part — I shall still have some sort of a finger in the pie. When I am dead, you can boil me, burn me, drown me, scatter me — but you cannot destroy me: my little atoms would merely deride such heavy vengeance. Death can do no more than kill you."

Dust is made of fine particles of solid matter. On Earth, it generally consists of particles in the atmosphere that come from various sources such as soil lifted by wind, volcanic eruptions, and pollution.
"For dust thou art, and unto dust shall thou return."
"When darkness gathers over all. And the last tottering pillars fall, Take the poor dust Thy mercy warms. And mould it into heavenly forms."
"Whose touch turns hope to dust—the dust we all have trod."
"And now, its time to leave and turn to dust"
"Can honours voice provoke the silent dust, Or flattery soothe the dull cold ear of death?"
"We turn to dust, and all our mightiest works Die too."