“Gravitation is not responsible for people falling in love.”

Jotted (in German) on the margins of a letter to him (1933), p. 56
Unsourced variants: Gravitation is not responsible for people falling in love. / You can't blame gravity for falling in love.
Attributed in posthumous publications, Albert Einstein: The Human Side (1979)

Variant: It's one thing to fall in love. It's another to feel someone else fall in love with you, and to feel a responsibility toward that love.
Source: Every Day

"J.B. Runs Things," Short Stories and Index: Elbert Hubbard's Selected Writings, Part 14 (1923) [Kessinger Publishing, 1998, ISBN 0766103978], p. 278.

Misattributed
Source: Elbert Hubbard, "J.B. Runs Things," Short Stories and Index: Elbert Hubbard's Selected Writings, Part 14 (1923) [Kessinger Publishing, 1998, ISBN 0766103978], p. 278.

Lyrics, Light Grenades (2006)

Source: Monsieur

Source: The Shadow Queen

As quoted in Contemporary Authors New Revision Series: A Bio-Bibliographical Guide to Current Writers in Fiction, General Non-Fiction, Poetry, Journalism, Drama, Motion Pictures, Television, & Other Fields (1982) by Ann Evory
Context: I talk about the things people have always talked about in stories: pain, hate, truth, courage, destiny, friendship, responsibility, growing old, growing up, falling in love, all of these things. What I try to write about are the darkest things in the soul, the mortal dreads. I try to go into those places in me that contain the cauldrous. I want to dip up the fire, and I want to put it on paper. The closer I get to the burning core of my being, the things which are most painful to me, the better is my work. … It is a love/hate relationship I have with the human race. I am an elitist, and I feel that my responsibility is to drag the human race along with me — that I will never pander to, or speak down to, or play the safe game. Because my immortal soul will be lost.

Source: Freedom