Fate is one of the main forces within the world of Jojo's Bizarre Adventure, which drives the events and results of the story to take place. Usually, when a fate is decided, it cannot be changed unless another force alters that fate.
In Golden Wind, after the defeat of Diavolo. A flashback is shown where members Bucciarati's crew investigate a sculptor who's girlfriend had willingly fell to her death, and during the encounter learn he's a Stand user. The sculptor's Stand showcases the fate of Bucciarati, Narancia, and Abbacchio, which commences later within the story.
The special part and the reason fate is being mentioned, is that through Time Erase, while others are forced to subconsciously commit to the actions they were fated to do, Diavolo can move freely. This means that through this ability, Diavolo can change his own fate.
Sleeping Slaves Part 5, Chapter 155.