I am well acquainted with all the arguments against freedom of thought and speech — the arguments which claim that it cannot exist, and the arguments which claim that it ought not to. I answer simply that they don't convince me and that our civilization over a period of four hundred years has been founded on the opposite notice. For quite a decade past I have believed that the existing Russian régime is a mainly evil thing, and I claim the right to say so, in spite of the fact that we are allies with the USSR in a war which I want to see won. If I had to choose a text to justify myself, I should choose the line from Milton:
  By the known rules of ancient liberty.
The word ancient emphasizes the fact that intellectual freedom is a deep-rooted tradition without which our characteristic western culture could only doubtfully exist. From that tradition many of our intellectuals are visibly turning away. They have accepted the principle that a book should be published or suppressed, praised or damned, not on its merits but according to political expediency. And others who do not actually hold this view assent to it from sheer cowardice.

What It Means

This is a placeholder explanation generated by the low-overhead model. It interprets "I am well acquainted with all the arguments against freedom of thought and speech — the arguments which claim that it cannot exist, and the arguments which claim that it ought not to. I answer simply that they don't convince me and that our civilization over a period of four hundred years has been founded on the opposite notice. For quite a decade past I have believed that the existing Russian régime is a mainly evil thing, and I claim the right to say so, in spite of the fact that we are allies with the USSR in a war which I want to see won. If I had to choose a text to justify myself, I should choose the line from Milton:
  By the known rules of ancient liberty.
The word ancient emphasizes the fact that intellectual freedom is a deep-rooted tradition without which our characteristic western culture could only doubtfully exist. From that tradition many of our intellectuals are visibly turning away. They have accepted the principle that a book should be published or suppressed, praised or damned, not on its merits but according to political expediency. And others who do not actually hold this view assent to it from sheer cowardice." in the context of "Original preface to Animal Farm; as published in George Orwell: Some Materials for a Bibliography (1953) by Ian R. Willison" to mean that wisdom is timeless.