“For those who believe, no proof is necessary. For those who don’t believe, no proof is possible.”

I'm not quite sure how to rate this; — so very accurate in practical applications, more often than not. BUT, there is always the exception. As I've expressed here before and by way of personal experience: when I was young, a Pastor told me to doubt everything and prove up the Lord daily. He also gave me a methodology how to garner proof of the spirit. It is a long journey with fruit along the way.

The "wolf in sheep's clothing" Fabian socialism vs Gladstonian classical liberalism. The UK wishing to hold power globally through the promoting of the modern " capitalist welfare state" teaching communist tenants world wide. Post WWII 
The quote has nothing to do with a religious belief system. 

A little more context. Stuart Chase, a Fabian socialist promoting and favoring a modern "capitalist welfare state" modelled after the Bismarkian German model welfare state. Now the siege seen more clearly upon the Constitutional Republican form of government established in the USA.