Pyrrhus, when his friends congratulated to him his victory over the Romans under Fabricius, but with great slaughter of his own side, said to them, "Yes; but if we have such another victory, we are undone."
Francis Bacon
Friendship
A quote by Francis Bacon
From the source
Apothegms. No. 193.
Recorded in John Bartlett’s Familiar Quotations, ninth edition, 1905 printing.