“You have mosquitoes. I have the Press.”

The earliest known example of this quote comes from a January 1993 article in Time magazine, where it is associated with British businesswoman Anita Roddick:: "Even Body Shop trucks are employed as rolling billboards for pithy slogans. Roddick's current favorite, taken from the side of one of her company's lorries: IF YOU THINK YOU'RE TOO SMALL TO HAVE AN IMPACT, TRY GOING TO BED WITH A MOSQUITO".
IN the 21st century, it was cited as an "African proverb". Earliest attribution to Dalai Lama is from 2004.
Disputed
Source: Philip Elmer-DeWitt, "Anita the Agitator" https://books.google.com/books?id=Cm7uAAAAMAAJ&dq=%22anita+roddick%22+mosquito&focus=searchwithinvolume&q=mosquito, Time, 1993-01-25
Source: https://indianinthemachine.wordpress.com/2010/01/14/if-you-think-youre-too-small-to-make-a-difference-try-sleeping-in-a-closed-room-with-a-mosquito-african-proverb/
Source: https://books.google.com/books?id=K8Q53xW1ie8C&pg=PA1&dq=%22too+small+to+make+a+difference%22+mosquito+lama&hl=en&sa=X&ved=0ahUKEwjjxrTbkbnJAhVHLYgKHVfdB84Q6AEIIjAB#v=onepage&q=%22too%20small%20to%20make%20a%20difference%22%20mosquito%20lama&f=false

Source: Welcome to Ralph's World: 10 of Ralph Klein's most colourful quotes http://www.ctvnews.ca/politics/welcome-to-ralph-s-world-10-of-ralph-klein-s-most-colourful-quotes-1.1216791

Source: Christopher and His Kind (1976), p. 335
Context: Suppose, Christopher now said to himself, I have a Nazi Army at my mercy. I can blow it up by pressing a button. The men in that Army are notorious for torturing and murdering civilians — all except for one of them, Heinz. Will I press the button? No — wait: Suppose I know that Heinz himself, out of cowardice or moral infection, has become as bad as they are and takes part in all their crimes? Will I press that button, even so? Christopher's answer, given without the slightest hesitation, was: Of course not.
That was a purely emotional reaction. But it helped Christopher think his way through to the next proposition. Suppose that Army goes into action and has just one casualty, Heinz himself. Will I press the button now and destroy his fellow criminals? No emotional reaction this time, but a clear answer, not to be evaded: Once I have refused to press that button because of Heinz, I can never press it. Because every man in that Army could be someone's Heinz and I have no right to play favorites. Thus Christopher was forced to recognize himself as a pacifist — although by an argument which he could only admit to with the greatest reluctance.

Tailgate Party (2009)

page 277
John of the Mountains, 1938

In a phone interview with Maria Bartiromo on Fox News November 29, 2020
2020, November 2020

This statement was attributed to Goering in at least one book on World War II, but it was removed from the English Wikipedia page on him on grounds that it was not actually verified that Goering had ever said it.
Disputed
Context: In 1940 I could at least fly as far as Glasgow in most of my aircraft, but not now! It makes me furious when I see the Mosquito. I turn green and yellow with envy. The British, who can afford aluminium better than we can, knock together a beautiful wooden aircraft that every piano factory over there is building, and they give it a speed which they have now increased yet again. What do you make of that? There is nothing the British do not have. They have the geniuses and we have the nincompoops. After the war is over I'm going to buy a British radio set – then at least I'll own something that has always worked.