"Achilles groaned and answered, "Mother, Olympian Jove has indeed vouchsafed me the fulfilment of my prayer, but what boots it to me, seeing that my dear comrade Patroclus has fallen- he whom I valued more than all others, and loved as dearly as my own life? I have lost him; aye, and Hector when he had killed him stripped the wondrous armour, so glorious to behold, which the gods gave to Peleus when they laid you in the couch of a mortal man. Would that you were still dwelling among the immortal sea-nymphs, and that Peleus had taken to himself some mortal bride. For now you shall have grief infinite by reason of the death of that son whom you can never welcome home- nay, I will not live nor go about among mankind unless Hector fall by my spear, and thus pay me for having slain Patroclus son of Menoetius."
The Iliad, book XVIII - translation by Samuel Butler in 1898.