Arturo Pérez-Reverte said this quote
“ He who kills from afar knows nothing at all about act of killing. He who kills from afar derives no lesson from life or from death; he neither risks nor stains his hands with blood, nor hears the breathing of his adversary, nor reads the fear, courage, or indifference in his eyes. He who kills from afar tests neither his arm, his heart, nor his conscience, nor does he create ghosts that will later haunt him every single night for the rest of his life. He who kills from afar is a knave who commends to others the dirty and terrible task that is his own. ”