The difference between genius and stupidity is that genius has its limits.

The difference between stupidity and genius is that genius has its limits.

There is no great genius without a mixture of madness. [Lat., Nullum magnum ingenium sine mixtura dementia.]

No great genius is without an admixture of madness.

Genius may have its limitations, but stupidity is not thus handicapped

The difference between genius and stupidity is that genius has its limits.