Mentorship

'Dear Princess Twilight:

Let me be frank. After all those years living under my roof which let you avoid consequences from your ever-growing weirdness without having to face consequences I just couldn't stand the sight of you. Nightmare Moon was simply the excuse to kick you out, and I gave you my old castle because I knew it'd keep you based out of Ponyville.

Please stop notifying me about absolutely everything as if you were the first creature ever to discover it and I wouldn't understand the details without your help. I have more than a millennium of experience in such matters and a far more social, empathic nature than you do. Limit these letters to concise, relevant reports.

Rather busy managing a continent-spanning superpower,

Princess Celestia'

'