“To be able to say how much you love is to love but little.”
"Canzone 137", as reported in Bartlett's Familiar Quotations (1968), p. 163
Il Canzoniere (c. 1351–1353), To Laura in Life
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Francesco Petrarca 73
Italian scholar and poet 1304–1374Related quotes

“They say religion is about love, but you wonder how much of it really is about fear.”
Source: The Nature of Jade

“It is sad not to be loved, but it is much sadder not to be able to love.”
To a Young Writer

this is a line spoken by Frank Morgan's depiction of the Wizard of Oz in the 1939 film, which debuted 20 years after Baum's death. It did not actually appear in the "Wonderful Wizard of Oz". The ending of "Steam Engines of Oz" wrongly attributes this phrase to Baum when it would've originated from the 1939 adaptation script writers Langley/Ryerson/Woolf.
Misattributed
Variant: A heart is not judged by how much you love; but by how much you are loved by others
Source: The Wonderful Wizard of Oz

“You may be hurt if you love too much, but you will live in misery if you love too little.”
Source: Napoleon Hill's Positive Action Plan: 365 Meditations For Making Each Day a Success

I Just Called to Say I Love You
Song lyrics, The Woman in Red (1984)

“Stacey puts a little love in each pasta shell. But it’s self-love, so it won’t help you that much.”
"Menus: Stacey’s Favorite Baked Shells & Cheese", Stacey's at Waterford, 2008-01-14 http://www.eatatstaceys.com/staceys-waterford/menus-lunch.php,
Restaurant menus

Source: age 12 http://www.vanityfair.com/magazine/2015/07/donald-ivana-trump-divorce-prenup-marie-brenner