Look at Satan. Created as an ...

Look at Satan. Created as an angel, grows up to be the Great Adversary. Hey, if you’re going to go on about genetics, you might as well say the kid will grow up to be an angel. After all, his father was really big in Heaven in the old days. Saying he’ll grow up to be a demon just because his dad became one is like saying a mouse with its tail cut off will give birth to tailless mice. No. Upbringing is everything. Take it from me.
Look at Satan. Created as an angel, grows up to be the Great Adversary. Hey, if you’re going to go on about genetics, you might as well say the kid will grow up to be an angel. After all, his father was really big in Heaven in the old days. Saying he’ll grow up to be a demon just because his dad became one is like saying a mouse with its tail cut off will give birth to tailless mice. No. Upbringing is everything. Take it from me.
 Terry Pratchett

Quotes from the same author

Anyway, lots of warrior tribes think that when they die, they go to a heavenly land somewhere," said the toad. "You know, where they can drink and fight and feast forever? So maybe this is theirs." "But this is a real place!" "So? That's what they believe. Besides, they're only small. Maybe the universe is a bit crowded and they have to put heavens anywhere there's room? I'm a toad, so you'll appreciate that I'm having to guess a lot here.
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 Terry Pratchett
I read the best works of some of the best satirists, and indeed best writers from the beginning of the Victorian era to about the 1960s. If you want to be a blacksmith, you go and watch the blacksmith working, and you work out what the blacksmith does.
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 Terry Pratchett
You can't make people happy by law. If you said to a bunch of average people two hundred years ago "Would you be happy in a world where medical care is widely available, houses are clean, the world's music and sights and foods can be brought into your home at small cost, traveling even 100 miles is easy, childbirth is generally not fatal to mother or child, you don't have to die of dental abscesses and you don't have to do what the squire tells you" they'd think you were talking about the New Jerusalem and say "yes.
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 Terry Pratchett
I must have read every issue of 'Punch' published in the 20th century, and I think in the process I picked up the true voice of English humour - that amiable, fairly liberal, laconic voice which you find in something like 'Three Men in a Boat.'
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 Terry Pratchett
I've lost both parents in the last two years, so you pick up on that stuff. That's the most terrible thing about being an author - standing there at your mother's funeral, but you don't switch the author off. So your own innermost thoughts are grist for the mill.
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 Terry Pratchett