The three-year-old who lies about taking a cookie isn't really a liar after all. He simply can't control his impulses. He then convinces himself of a new truth and eager for your approval reports the version that he knows will make you happy.
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.