I join with you most cordially [he wrote six months later to Sir Joseph Banks] in rejoicing at the return of Peace. I hope it will be lasting, and that Mankind will at length, as they call themselves reasonable Creatures, have Reason and Sense enough to settle their Differences without cutting Throats; for, in my opinion, _there never was a good War, or a bad Peace_. What vast additions to the Conveniences and Comforts of Living might Mankind have acquired, if the Money spent in Wars had been employed in Works of public utility! What an extension of Agriculture, even to the Tops of our Mountains: what Rivers rendered navigable, or joined by Canals: what Bridges, Aqueducts, new Roads, and other public Works, Edifices, and Improvements, rendering England a compleat Paradise, might have been obtained by spending those Millions in doing good, which in the last War have been spent in doing Mischief; in bringing Misery into thousands of Families, and destroying the Lives of so many thousands of working people, who might have performed the useful labor! The same sentiments are repeated in a letter to David Hartley: What would you think of a proposition, if I sh'd make it, of a family compact between England, France and America? America wd be as happy as the Sabine Girls, if she cd be the means of uniting in perpetual peace her father and her husband. What repeated follies are these repeated wars! You do not want to conquer & govern one another. Why then sh'd you continually be employed in injuring & destroying one another? How many excellent things might have been done to promote the internal welfare of each country; What Bridges, roads, canals and other usefull public works & institutions, tending to the common felicity, might have been made and established with the money and men foolishly spent during the last seven centuries by our mad wars in doing one another mischief! You are near neighbors, and each have very respectable qualities. Learn to be quiet and to respect each other's rights. You are all Christians. One is _The Most Christian King_, and the other _Defender of the Faith_. Manifest the propriety of these titles by your future conduct. "By this," says Christ, "shall all men know that ye are my Disciples, if ye love one another." "Seek peace, and ensue it." We make daily great Improvements in _Natural_, there is one I wish to see in _Moral_ Philosophy [he wrote to Richard Price] the Discovery of a Plan, that would induce & oblige Nations to settle their Disputes without first Cutting one another's Throats. When will human Reason be sufficiently improv'd to see the Advantage of this! The aspiration is again voiced in a letter to Joseph Priestley: