That movie line that Laura said at Logan's grave in Wolverine 3?

Excerpts from the movie Professor x watched in the hotel.

Shane: I have to go.

Joey: Why, Shane?

Shane: Everyone lives according to their heart, Joey. It cannot be radically changed. I tried to change it, but ultimately failed.

Joey: But we need you, Shane.

Shane: Joey, the era of killing is over, and we cannot turn back time. Right or wrong is just a sign. Now go home to your mother and tell her... tell her it's over and there will be no more gunfire in the valley.

The movie the professor watched in the film is called "Shane", an American western film from the 1950s. In the end, this paragraph serves as X-23’s epitaph to his father, James Howlett.