I've seen things you people wouldn't believe. Attack ships on fire off the shoulder of Orion. I watched c-beams glitter in the dark near the Tannhäuser Gate.I suppose I watched Blade Runner two or three times before I finally came to view this very brief soliloquy by the replicant as one of the key thematic moments of the film.
All those moments will be lost in time, like tears in rain.
Hauer, director Ridley Scott, and screenwriter David Peoples asserted that Hauer wrote the "Tears in Rain" speech... In his autobiography, Hauer said he merely cut the original scripted speech by several lines, adding only "All those moments will be lost in time, like tears in rain" although the original script, displayed during the documentary, before Hauer's rewrite, does not mention "Tanhauser Gate"...
Hauer said that these final lines showed that Batty wanted to "make his mark on existence... the robot in the final scene, by dying, shows Deckard what a real man is made of."
When Hauer performed the scene, the film crew applauded and some even cried. This was due to the power of the dying speech coming at the end of an exhausting shoot.