"limits themselves have limits."

....Everything has definite lines of demarcation which set it off from all other things. Otherwise it would not be a distinct entity with a unique identity. We have to discover these boundaries in practice and take them into account in our thinking. 

But these boundaries do not remain unaltered under all conditions; nor are they the same at all times. They fluctuate according to changing circumstances. This relative, mobile, fluid character of boundaries is ignored and denied by the laws of formal logic. These laws assert that everything has definite limits- but they overlook the far more important fact that these limits themselves have limits.