“If you think you're too small to make a difference, you've obviously never been in bed with a mosquito.”

“If you think you're too small to make a difference, you've never been to bed with a mosquito.”

“If you think you're too small to be effective, you've never been in the dark with a mosquito”

“If you think you are too small to make a difference, you have never been in a dark room with a mosquito”

“Anyone who thinks he's too small to make a difference has never been bit by a mosquito”

“If you think you're too small to have an impact, try going to bed with a mosquito in the room.”

“If you think you are too small to make a difference, try sleeping with a mosquito.”