Sanity, it would seem, was a ...

Sanity, it would seem, was a dangerously contagious disease.
 H. Beam Piper

Quotes from the same author

English is the product of a Saxon warrior trying to make a date with an Angle bar-maid, and as such is no more legitimate than any of the other products of that conversation.
 H. Beam Piper
Vengeance is a strange human motivation --- it can drive a man to do things which he neither would nor could achieve without it ... and because of that it lies behind some of the greatest sagas of human literature!
 H. Beam Piper