The Education of Achilles

Publilius Statius - Achilleid Book I
Chiron admits to Thetis that Achilles is becoming hard to control:

"I add not to thy fears, but will confess the truth: some swift and violent deed - the forebodings of a sire deceive me not - is preparing, far beyond his tender years. Formerly he was wont to endure my anger, and listen eagerly to my commands nor wander far from my cave; now Ossa cannot contain him, nor mightly Pelion and all the snows of Thessaly.

Even the Centaurs often complain to me of plundered homes and herds stolen before their eyes, and that they themselves are driven from field and river; they devise violence and fraud, and utter angry threats..."

Cold pallor seized the daughter of Nereus: lo! he was come, made larger by much dust and sweat, and yet for all his weapons and hastened labours still pleasant to the sight: a radiant glow shimmers on his snow-white countenance, and his locks shine more comely than tawny gold.