Zaphod felt he was teetering on the edge of madness and wondered if he shouldn't just jump over and have done with it.

The point is, you see," said Ford, "that there is no point in driving yourself mad trying to stop yourself going mad. You might just as well give in and save your sanity for later.

Sanity is a madness put to good uses.

Our occasional madness is less wonderful than our occasional sanity

Worse than madness. Sanity.

Sometimes, to regain sanity, one had to acknowledge and embrace the madness.