Bust of Alcibiades (4th century BC) at Palazzo dei Conservatori, Hall of the Triumphs
It is said, and with good reason, that the favour and affection which Socrates showed him contributed not a little to his reputation.
…
It was not long before many men of high birth clustered about him and paid him their attentions. Most of them were plainly smitten with his brilliant youthful beauty and fondly courted him. But it was the love which Socrates had for him that bore strong testimony to the boy’s native excellence and good parts. These Socrates saw radiantly manifest in his outward person, and, fearful of the influence upon him of wealth and rank and the throng of citizens, foreigners and allies who sought to preempt his affections by flattery and favour, he was fain to protect him, and not suffer such a fair flowering plant to cast its native fruit to perdition. For there is no man whom Fortune so envelops and compasses about with the so-called good things of life that he cannot be reached by the bold and caustic reasonings of philosophy, and pierced to the heart. And so it was that Alcibiades, although he was pampered from the very first, and was prevented by the companions who sought only to please him from giving ear to one who would instruct and train him, nevertheless, through the goodness of his parts, at last saw all that was in Socrates, and clave to him, putting away his rich and famous lovers. And speedily, from choosing such an associate, and giving ear to the words of a lover who was in the chase for no unmanly pleasures, and begged no kisses and embraces, but sought to expose the weakness of his soul and rebuke his vain and foolish pride,
“He crouched, though warrior bird, like slave, with drooping wings.”
And he came to think that the work of Socrates was really a kind of provision of the gods for the care and salvation of youth. Thus, by despising himself, admiring his friend, loving that friend’s kindly solicitude and revering his excellence, he insensibly acquired an "image of love,” as Plato says, “to match love,” and all were amazed to see him eating, exercising, and tenting with Socrates, while he was harsh and stubborn with the rest of his lovers.
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But the love of Socrates, though it had many powerful rivals, somehow mastered Alcibiades. For he was of good natural parts, and the words of his teacher took hold of him and wrung his heart and brought tears to his eyes. But sometimes he would surrender himself to the flatterers who tempted him with many pleasures, and slip away from Socrates, and suffer himself to be actually hunted down by him like a runaway slave. And yet he feared and reverenced Socrates alone, and despised the rest of his lovers.
—Plutarch, The Life of Alcibiades