"...if we build our palace on some unknown wrong it turns very slowly into our prison. Macbeth at the end of the play is not merely a wild beast; he is a caged wild beast."

Before we talk then of the lesson of a great work of art, let us realize that it has a different lesson for different ages, because it is itself eternal. And let us realize that such a lesson will be in our own day not absolute but suited to the particular vices or particular misfortunes of that day. We are not in any danger at the moment of the positive and concrete actions which correspond to those of Macbeth. The good old habit of murdering kings (which was the salvation of so many commonwealths in the past) has fallen into desuetude. The idea of such a play must be for us (and for our sins) more subtle. The idea is more subtle but it is almost inexpressibly great. Let us before reading the play consider if only for a moment what is the main idea of Macbeth for modern men.

One great idea on which all tragedy builds is the idea of the continuity of human life. The one thing a man cannot do is exactly what all modern artists and free lovers are always trying to do. He cannot cut his life up into separate sections. The case of the modern claim for freedom in love is the first and most obvious that occurs to the mind; therefore I use it for this purpose of illustration. You cannot have an idyll with Maria and an episode with Jane; there is no such thing as an episode. There is no such thing as an idyll. It is idle to talk about abolishing the tragedy of marriage when you cannot abolish the tragedy of sex. Every flirtation is a marriage; it is a marriage in this frightful sense; that it is irrevocable. I have taken this case of sexual relations as one out of a hundred; but of any case in human life the thing is true. The basis of all tragedy is that man lives a coherent and continuous life. It is only a worm that you can cut in two and leave the severed parts still alive. You can cut a worm up into episodes and they are still living episodes. You can cut a worm up into idylls and they are quite brisk and lively idylls. You can do all this to him precisely because he is a worm. You cannot cut a man up and leave him kicking, precisely because he is a man. We know this because man even in his lowest and darkest manifestation has always this characteristic of physical and psychological unity. His identity continues long enough to see the end of many of his own acts; he cannot be cut off from his past with a hatchet; as he sows so shall he reap.

This then is the basis of all tragedy, this living and perilous continuity which does not exist in the lower creatures. This is the basis of all tragedy, and this is certainly the basis of Macbeth. The great ideas of Macbeth, uttered in the first few scenes with a tragic energy which has never been equalled perhaps in Shakespeare or out of him, is the idea of the enormous mistake a man makes if he supposes that one decisive act will clear his way. Macbeth's ambition, though selfish and someway sullen, is not in itself criminal or morbid. He wins the title of Glamis in honourable war; he deserves and gets the title of Cawdor; he is rising in the world and has a not ignoble exhilaration in doing so. Suddenly a new ambition is presented to him (of the agency and atmosphere which presents it I shall speak in a moment) and he realizes that nothing lies across his path to the Crown of Scotland except the sleeping body of Duncan. If he does that one cruel thing, he can be infinitely kind and happy.

Here, I say, is the first and most formidable of the great actualities of Macbeth. You cannot do a mad thing in order to reach sanity. Macbeth's mad resolve is not a cure even for his own irresolution. He was indecisive before his decision. He is, if possible, more indecisive after he has decided. The crime does not get rid of the problem. Its effect is so bewildering that one may say that the crime does not get rid of the temptation. Make a morbid decision and you will only become more morbid; do a lawlesss thing and you will only get into an atmosphere much more suffocating than that of law. Indeed, it is a mistake to speak of a man as `breaking out.' The lawless man never breaks out; he breaks in. He smashes a door and finds himself in another room, he smashes a wall and finds himself in a yet smaller one. The more he shatters the more his habitation shrinks. Where he ends you may read in the end of Macbeth.

For us moderns, therefore, the first philosophical significance of the play is this; that our life is one thing and that our lawless acts limit us; every time we break a law we make a limitation. In some strange way hidden in the deeps of human psychology, if we build our palace on some unknown wrong it turns very slowly into our prison. Macbeth at the end of the play is not merely a wild beast; he is a caged wild beast.

-The Spice of Life
(collection of essays published posthumously in 1964)