'their ends' are the issues or outcomes of our thoughts, and these, says the speaker, are not our own. The tragic world is a world of action, and action is the translation of thought into reality. We see men and women confidently attempting it. They strike into the existing order of things in pursuance of their ideas. But what they achieve is not what they intended; it is terribly unlike it. They understand nothing, we say to ourselves, of the world on which they operate. They fight blindly in the dark, and the power that works through them makes them the instrument of a design which is not theirs. They act freely, and yet their action binds them hand and foot. And it makes no difference whether they meant well or ill. No one could mean better than Brutus, but he contrives misery for his country and death for himself. No one could mean worse than Iago, and he too is caught in the web he spins for others. Hamlet, recoiling from the rough duty of revenge, is pushed into blood-guiltiness he never dreamed of, and forced at last on the revenge he could not will. His adversary's murders, and no less his adversary's remorse, bring about the opposite of what they sought. Lear follows an old man's whim, half generous, half selfish; and in a moment it looses all the powers of darkness upon him. Othello agonises over an empty fiction, and, meaning to execute solemn justice, butchers innocence and strangles love. They understand themselves no better than the world about them. Coriolanus thinks that his heart is iron, and it melts like snow before a fire. Lady Macbeth, who thought she could dash out her own child's brains, finds herself hounded to death by the smell of a stranger's blood. Her husband thinks that to gain a crown he would jump the life to come, and finds that the crown has brought him all the horrors of that life. Everywhere, in this tragic world, man's thought, translated into act, is transformed into the opposite of itself. His act, the movement of a few ounces of matter in a moment of time, becomes a monstrous flood which spreads over a kingdom. And whatsoever he dreams of doing, he achieves that which he least dreamed of, his own destruction.