Writing a book is an adventure.

If, however, there is to be a war of nerves let us make sure our nerves are strong and are fortified by the deepest convictions of our hearts.

There are two processes which we adopt consciously or unconsciously when we try to prophesy. We can seek a period in the past whose conditions resemble as closely as possible those of our day, and presume that the sequel to that period will, save for some minor alterations, be similar. Secondly, we can survey the general course of development in our immediate past, and endeavor to prolong it into the near future. The first is the method the historian; the second that of the scientist. Only the second is open to us now, and this only in a partial sphere.

If this is a blessing, it is certainly very well disguised.

A pessimist sees problems in opportunities whereas an optimist sees opportunities in problems.

We shall defend our island, whatever the cost may be, we shall fight on the beaches, we shall fight on the landing grounds, we shall fight in the fields and in the streets, we shall fight in the hills; we shall never surrender.

From now on we shall bomb Germany on an ever-increasing scale, month by month, year by year, until the Nazi regime has either been exterminated by us or - better still - torn to pieces by the German people themselves.