The greatest of human problems, and the greatest of our common tasks, is to keep the peace and to save the future. All that we have built in the wealth of nations, and all that we plan to do toward a better life for all, will be in vain if our feet should slip, or our vision falter, and our hopes ended in another worldwide war. If there is one commitment more than any other that I would like to leave with you today, it is my unswerving commitment to the keeping and to the strengthening of the peace. Peace is a journey of a thousand miles and it must be taken one step at a time.

Lyndon B. Johnson (1908-1973) American politician, educator, US President (1963-69)

Speech (1963-12-17), United Nations General Assembly
    (Source)

John Kennedy had used the same "journey" phrase from Lao-tzu early that year, before his assassination.