John Donne was an English poet.
Jake Sisko recalled someone once said "every man's death diminishes me" but could not recall that it was from a work by Donne. In Jake's case, he was illuminating his belief that all sentient life was precious, including animals, and he thought the word creature could replace the word man in the work. (DS9 novel: Trapped in Time)
Deanna Troi once recited the entire work by Donne, which included the well-known phrases "no man is an island" and "therefore never send to know for whom the bell tolls, it tolls for thee". When Alexander Rozhenko asked if Troi was done with the quote, Troi thought Alexander had recognized that the quote was from Donne. Alexander also added that the quote was applicable to Humans, but not Klingons. (TNG novel: Triangle: Imzadi II)
Mark McHenry once quoted Donne: "a fancy, a chimera in my brain troubles me in my prayer". McHenry knew some of Donne's works, but commented that that particular quote he took to heart. (NF novel: Being Human)