I firmly believe that love [of a subject or hobby] is a better teacher than a sense of duty—at least for me.

Albert Einstein · From a 1940 draft letter to his friend the physicist Philipp Frank; the shared "Love is a better teacher than duty" is a shortening, and the bracketed gloss is the editor's.

Falling in love is not at all the most stupid thing that people do, but gravitation cannot be held responsible for it.

Albert Einstein · Scribbled in 1933 on a letter from a man who argued that gravity, by turning people sideways and upside down as the earth rotates, explained why they do foolish things like falling in love; the meme form "Gravitation is not responsible for people falling in love" is the trimmed version.

Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.

Albert Einstein · Said to George Sylvester Viereck in an interview published in The Saturday Evening Post on 26 October 1929.

Try not to become a man of success but rather try to become a man of value.

Albert Einstein · Recorded by LIFE editor William Miller during a visit to Einstein's Princeton home a few months before his death.

You should be kissed, and often, and by someone who knows how.

Rhett Butler · Clark Gable's blockade runner in Gone with the Wind (1939) · Rhett to Scarlett in the Paris bonnet scene, a line written for the film by Sidney Howard and not found in the novel.

Keep love in your heart. A life without it is like a sunless garden when the flowers are dead.

Attributed to Oscar Wilde · Recorded by Harold Mellor, a friend who travelled with Wilde in 1898 to 1900, and printed only in 1949 in the Marquess of Queensberry's Oscar Wilde and the Black Douglas; Quote Investigator finds it plausible but resting on one man's memory half a century on.

A successful marriage requires falling in love many times, always with the same person.

Mignon McLaughlin · An aphorism from the second collection of the Glamour editor's "Neurotic's Notebook" sayings.

“I firmly believe that love [of a subject or hobby] is a better teacher than a sense of duty—at least for me.”

“Falling in love is not at all the most stupid thing that people do, but gravitation cannot be held responsible for it.”

“Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.”

“Try not to become a man of success but rather try to become a man of value.”

“You should be kissed, and often, and by someone who knows how.”

“Keep love in your heart. A life without it is like a sunless garden when the flowers are dead.”

“A successful marriage requires falling in love many times, always with the same person.”

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