This is one of the last things Franz Schubert ever wrote. The poet here is Ludwig Rellstab, one of the better German Romantic poets. The 4 bar introduction is the best 4 bars Schubert ever wrote. The trick is where the G# is placed, and a noted Schubert pianist once told me that it was very tricky to play. One minor mistake and the whole effect is ruined. The first time I heard those 4 bars I thought the top of my head would come off.
The key change back to G Major at 2:00 is sublime.
Schubert: “Love’s Message”