AG: Cause even though you got all these highfalutin morals and fancy reserv8tions, you know as well as me that a killer is a killer is a killer!
AG: There 8n’t no ch8nging your ways for good, and one d8y you’re going to flail that silly l8ttle cane of yours and not find n8thin to 8ump into, and fall f8ce first into the shit ag8in.
AG: And you’re going to do something t8rri8le to some8ody and wish you could t8ke it 8ack 8ut you c8n’t!!!!!!!!
AG: And then you’ll work hard to win 8ack their trust, and you’ll try and try and tr8, and you’ll see how hard it is!
AG: You’ll seeeeeeee!

Oh shit. I read to the part where Terezi tells Doc Scratch about Vriska’s magic cue ball, and now this foreshadowing makes a lot more sense.