Yes, Minister, Series Three (1982)

Bernard:
If it's our job to carry out government policies, shouldn't we believe in them?

Sir Humphrey:
Oh, what an extraordinary idea! I have served 11 governments in the past 30 years. If I'd believed in all their policies, I'd have been passionately committed to keeping out of the Common Market, and passionately committed to joining it. I'd have been utterly convinced of the rightness of nationalising steel and of denationalising it and renationalising it. Capital punishment? I'd have been a fervent retentionist and an ardent abolitionist. I'd have been a Keynesian and a Friedmanite, a grammar school preserver and destroyer, a nationalisation freak and a privatisation maniac, but above all, I would have been a stark-staring raving schizophrenic!