It's easy to understand his approach.
It's hard to understand his approach.
I think it means that its HARD to understand his approach, because a method...IN MADNESS........ Really cant be understood!
I understand this to mean, "Even though he APPEARS to be mad, or even IS mad, it is clear to see that there is a definite, sane plan behind his actions."
The point, Robyn:
It first glance his actions appear to be madness (chaotic, pointless), but taking a deeper look reveals a coherent plan.
Every person has a different kind of madness..... There can't be methods in ALL of them...!?