There is no genius free from some tincture of madness

There is no genius without a mixture of madness.

Some were brilliant bordering on genius. Others, genius bordering on madness

No great genius has ever existed without some touch of madness.

There is no great genius without some touch of madness.

What madness it is for a man to starve himself to enrich his heir, and so turn a friend into an enemy! For his joy at your death will be proportioned to what you leave him