The truth is often a terrible weapon of aggression. It is possible to lie, and even to murder, for the truth...

Nearer, my God, to thee,
Nearer to thee!
E`en though it be a cross
That raiseth me:
Still all my song would be,
"Nearer, my God, to thee,
Nearer to thee!"

Nothing is more dangerous 
than an idea,
when you have only one idea...

This man has only one idea
in his head.