Where did the phrase "a passer-by is a passer-by" appear?

Appear in the slogan of light encounter.

Sky Encounter | Travelers are passers-by, and passers-by are travelers.

Welcome to the land of light, please don't put too much emotion into it, because travelers are travelers, and travelers are travelers.

Someone came to see you and someone left.

Someone will meet you again after disappearing for a while.

Someone has been with you for a long time, but you still left without saying goodbye.

Someone walked with you far, far away.

Someone just happened to meet you.

Your world shines because of them.

Because they're getting dim.

Expectation, loss, waiting, parting, reunion, companionship and disappearance. ...

Finally, you finally chose to leave without saying goodbye ...

This is the encounter of light. ...