It wasn’t easier, the ghost explains, you just knew how to do it. Sometimes the easiest method you know is the hardest method there is.
It’s like… to someone who only knows how to dig with a spoon, the notion of digging something as large as a trench will terrify them. All they know are spoons, so as far as they’re concerned, digging is simply difficult. The only way they can imagine it getting any easier is if they change – digging with a spoon until they get stronger, faster, and tougher. And the dangerous people, they’ll actually try this.
On the importance of looking for more efficient ways to do things.
The part after it was about how bad guys tend to be like people who have overspecialized in a less useful skill. You will never be able to beat them at what they do, but you don’t need to. Said in the context of a very under-powered protagonist. Time for the rest of the quote, though it makes less and less sense as time goes on.