Be aware of danger-but recognize the opportunity

What's the use of being Irish if the world doesn't break your heart?

While we shall never weary in the defense of freedom, neither shall we ever abandon the pursuit of peace.

Without debate, without criticism no administration and no country can succeed and no republic can survive.

But I think the American people expect more from us than cries of indignation and attack. The times are too grave, the challenge too urgent, and the stakes too high to permit the customary passions of political debate. We are not here to curse the darkness, but to light the candle that can guide us through that darkness to a safe and sane future. As Winston Churchill said on taking office some twenty years ago: if we open a quarrel between the present and the past, we shall be in danger of losing the future.

Perhaps scientists have been the most international of all professions in their outlook... Every time you scientists make a major invention, we politicians have to invent a new institution to cope with it-and almost invariably, these days, it must be an international institution.

Peace need not be impracticable, and war need not be inevitable.