The only time in the history of the world that we have had any extended periods of peace is when there has been a balance of power. It is when one nation becomes infinitely more powerful in relation to its potential competitors that the danger of war arises.

Restoring nature to its natural state is a cause beyond party and beyond factions. It has become a common cause of all the people of this country. It is a cause of particular concern to young Americans, because they more than we will reap the grim consequences of our failure to act on programs which are needed now if we are to prevent disaster later.

When I spoke at the St. Lawrence Seaway ceremonies in 1969, I borrowed some words from the monument there which I had joined Queen Elizabeth in dedicating just 10 years before. That monument, as its inscription puts it, 'bears witness to the common purpose of two nations whose frontiers are the frontiers of friendship, whose ways are the ways of freedom, whose works are the works of peace'.

I'm not a lovable man.

I can take it. The tougher it gets, the cooler I get.

For one priceless moment in the whole history of man, all of the people on this earth are truly one. One in their pride at what you have done, one in our prayers that you will return safely to earth.

The more you stay in this kind of job, the more you realize that a public figure, a major public figure, is a lonely man.