
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
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
“Nothing, no one, is too small to matter. What you do is going to make a difference.”
Source: A Swiftly Tilting Planet
“You have mosquitoes. I have the Press.”
In a 1966 conversation with the matron of a hospital while on a tour of the Caribbean as quoted in The Reality of Monarchy (1970) by Andrew Duncan
1960s
Source: The Butterfly Effect: How Your Life Matters
Variant: You drink a little too much and try a little too hard. And you go home to a cold bed and think, That was fine. And your life is a long line of fine.
Source: Gone Girl
“When you have been close to death it makes you think about life.”
Building a Better Business (2005)