… Fuck. Fine, I’ll look it up.
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Okay, he didn’t use those exact words, but he said “How easy it is to make people believe a lie, and how hard it is to undo that work again!”.
Source: https://quoteinvestigator.com/2020/12/23/fooled/#180a2d81-ad60-4996-9c9a-3b9cd697903c
Which cites
https://books.google.com/books?id=Q6c2AQAAMAAJ&q="believe+a+lie"#v=snippet&q="believe+a+lie"&f=false
I’m between Chrono Trigger and New Vegas, but I’m leaning towards New Vegas.