The dialogue opens with Socrates approaching the proud and ambitious young Alcibiades, who is preparing to enter Athenian public life with grand designs of ruling not just Athens, but all of Greece and Asia. Socrates halts his approach by asking a fundamental question: what is the specific subject about which Alcibiades intends to advise the citizens? When Alcibiades answers that he will advise on war and peace, Socrates forces him to admit that war and peace depend entirely on justice and injustice.
Socrates then systematically dismantles Alcibiades's claim to understand justice. Through rigorous questioning, Alcibiades is forced to concede that he never learned the nature of justice from a master, nor did he discover it independently. Instead, he blindly adopted the views of the uneducated multitude, who constantly quarrel and contradict one another on the very subject. Driven into a corner, Alcibiades is reduced to complete intellectual perplexity, admitting that he knows nothing of politics or justice.
Despite this humiliation, Alcibiades realizes he is no worse off than the current statesmen of Athens, who also lack proper training. However, Socrates raises the stakes, arguing that Alcibiades's true rivals are not local politicians, but the Spartan kings and the Persian monarch, who surpass him in noble birth, wealth, and rigorous education. To compete at this level, political ambition alone is useless; one must undergo deep personal transformation.
The core argument shifts toward the famous Delphic injunction to know oneself. Socrates proves that a human being is not the physical body, but the soul—the user of the body. Just as an eye can only see itself by looking into the purest part of another eye, the soul must look inward at its own divine element, which is wisdom and virtue, to attain self-knowledge.
Without this inner knowledge, neither individuals nor cities can act rightly, and power combined with ignorance inevitably leads to ruin. The dialogue concludes with a humbled Alcibiades recognizing his spiritual enslavement to ignorance and vowing to follow Socrates from that day forward to learn the true art of self-care and justice.
