“Have I done the world good, or have I added a menace?”
Marconi, 1934: cited in Raboy, Marc (2016) The Man Who Networked the World, p. 631 https://books.google.com/books?id=qn59DAAAQBAJ&pg=PA631&lpg=PA631#v=onepage&q&f=false|Marconi:
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Guglielmo Marconi 3
Italian inventor and radio pioneer 1874–1937Related quotes

Senza dubbio, ho fatto del male alla società, ma io facevo per difendere la mia vita; per essa avrei dato fuoco a tutto il mondo.
As quoted in Voci dall'ergastolo

Quoted in Kumble Calls It A day: Quotes... For and By Kumble..., 20 December 2013, Zee News India http://zeenews.india.com/kumble/story.aspx?aid=480775,

“We are the sum of all we have done added to the sum of all that has been done to us.”
Source: Golden Fool

“I have done my best, and I hope I have sown some seeds which may bring forth good fruit.”
Essentials to Peace (1953)
Context: I fear, in fact I am rather certain, that due to my inability to express myself with the power and penetration of the great Churchill, I have not made clear the points that assume such prominence and importance in my mind. However, I have done my best, and I hope I have sown some seeds which may bring forth good fruit.

Memoirs of J. Casanova de Seingalt (1894)

From interview with Komal Nahta