TANNER: Of all human struggles there is none so treacherous and remorseless as the struggle between the artist man and the mother woman. Which shall use up the other? That is the issue between them. And it is all the deadlier because, in your romanticist cant, they love one another.
OCTAVIUS: Even if it were so — and I don’t admit it for a moment — it is out of the deadliest struggles that we get the noblest characters.
TANNER: Remember that the next time you meet a grizzly bear or a Bengal tiger, Tavy.
OCTAVIUS: I meant where there is love, Jack.
TANNER: Oh, the tiger will love you. There is no love sincerer than the love of food. I think Ann loves you that way: she patted your cheek as if it were a nicely underdone chop.

George Bernard Shaw (1856-1950) British playwright and critic

Man and Superman, Act 1, l. 184-188 (1903)
    (Source)

Often just the "There is no love sincerer than the love of food" portion is quoted.