“So the future depends not only on what we do but on what other powers do. Will they join in the nuclear arms race or save their resources for later, more renumerative uses? Will they increase their productivity while we succumb to inflation and its social and economic consequences? Will they live in harmony at home while we remain riven by factionalism and terrorized by crime? Most important of all, will they choose their goals wisely and pursue them relentlessly while we flounder in aimlessness or exhaust ourselves in internecine struggles? These matters are quite as important as the decline of absolute American power in determining the equilibrium of international relations in the 1970s. One thing is sure: the international challenge tends to merge more and more with the domestic challenge until the two become virtually indistinguishable. The threats from both sources are directed at the same sources of national power which provide strength both for our national security and for our domestic welfare. It is clear, I believe, that we cannot overcome abroad and fail at home, or succeed at home and succumb abroad. To progress toward the goals of our security and welfare we must advance concurrently on both foreign and domestic fronts by means of integrated national power responsive to a unified national will.”

Closing words, p. 421-422
Swords and Plowshares (1972)