LELAND: I can remember absolutely everything, young man. That’s my curse. That’s one of the greatest curses ever inflicted on the human race, memory.

Herman J. Mankiewicz (1897–1953) American screenwriter, journalist, theater critic

Citizen Kane (1941) [with Orson Welles]
    (Source)

As scripted:

I can remember everything. That's my curse, young man. It's the greatest curse that's ever been inflicted on the human race. Memory.

There is still significant debate as to whether Mankiewicz or Welles should be given primary credit for the screenplay (as written and as filmed). For more, see here.