Someone said it more succinctly in 1979 "The most effective debugging tool is still careful thought, coupled with judiciously placed print statements." -- Bria

Someone said it more succinctly in 1979 "The most effective debugging tool is still careful thought, coupled with judiciously placed print statements." -- Brian Kernighan and followed it up with "Everyone knows that debugging is twice as hard as writing a program in the first place. So if you're as clever as you can be when you write it, how will you ever debug it?"