There is nothing to fear in the dreaming. Only that which we bring with us. The dreaming takes us forward and the dreaming takes us back.
This episode contains examples of:
The Atoner: Delenn has regretted starting the Earth-Minbari War, and has been trying to make up for it ever since.
Awful Truth: Callenn clearly regards the fact that many modern Minbari have human DNA as this, and Delenn is able to use it to leverage an agreement where he approves her marriage as an ancient Minbari reconciliation custom in exchange for her keeping it to herself.
Rewind, Replay, Repeat: The vision replays over and over in Delenn's mind until she realizes that the important part of the vision was what Dukhat was trying to tell her just before he died. She then goes back to The Dreaming in order to hear what it was:
Dukhat: There was a purpose to my selection. Your heritage—you are a child of Valen.
Secret Legacy: Delenn finds out she is descended from Valen, a.k.a. Jeffrey Sinclair, which means she's always been part human.
The Minbari in general during the war with the humans. As one of Delenn's colleagues tells her, they are "a world gone mad", and the fires of their madness cannot now be controlled; they must burn out over time.
Warts And All: Delenn fears that her standing with Lennier would be harmed from his knowing her involvement in starting the Earth/Minbari War. She's wrong; Lennier holds no grudge despite losing family on the Black Star.