In Act 2.1.293-325, we witness Prospero's loathing of the slave. Caliban protests and calls Prospero names, and Prospero, in a voice drippping with hatred, tells his "poisonous slave,"
For this sure be tonight thou shalt have cramps.
Side-stitches that shall pen thy breath up. Urchins
Shall forth at vast of night, that they may work
All exercise on thee. Thou shalt be pinched
As thick as honeycomb, each pinch more stinging
Than bees that made 'em.
In Act 5.1,925-300, Caliban and Prospero have reached an uneasy truce. After apologizing to Alfonso for Caliban's manners, he says to Caiban, "Go, sirrah, to my cell/Take with you your companions. As you look/To have my pardon,/Trim* it handsomely" (*trim = tidy, decorate).
Caliban responds, "Ay, that I will; and I'll be wise hereafter,/And seek for grace."