Mark 9:17-19 (New King James Version)
17 Then one of the crowd answered and said, “Teacher, I brought You my son, who has a mute spirit. 18 And wherever it seizes him, it throws him down; he foams at the mouth, gnashes his teeth, and becomes rigid. So I spoke to Your disciples, that they should cast it out, but they could not.”
19 He answered him and said, “O faithless generation, how long shall I be with you? How long shall I bear with you? Bring him to Me.”
The word doppelgänger is a loanword from German: Doppel (double) and Gänger (walker). It was first used by Jean Paul in the novel Siebenkäs (1796), and explained by a footnote.
As is true for all other common nouns in German, the word is written with an initial capital letter. I…