As Greenblatt describes it, Lucretius (borrowing from Democritus and others), says the universe is made of an infinite number of atoms ...
... moving randomly through space, like dust motes in a sunbeam, colliding, hooking together, forming complex structures, breaking apart again, in a ceaseless process of creation and destruction. There is no escape from this process. ... There is no master plan, no divine architect, no intelligent design.
...the unlikely hero of this tale, a young man, who, when he wasn't trying to gouge out the eyes of his fellow secretaries at the Vatican, turned out to be a pretty lucky book hunter. Without Poggio Bracciolini, nobody today would be reading Lucretius.
joy in existence — not suffering, or atoning or endurance — is the point of life. Greenblatt says that some of the world shakers who would be directly influenced by Lucretius' ideas are Galileo, Einstein and our very own American apostle of the "pursuit of happiness," Thomas Jefferson.