“ "Poirot," I said. "I have been thinking." "An admirable exercise my friend. Continue it." ”
Source: Peril at End House
Similar Quotes
I do this real moron thing, and it's called thinking. And apparently, I'm not a very good American because I like to form my own opinions. 
In meditation, try to go beyond thinking. As long as thoughts enter the mind, you are functioning on the conscious level. 
The scientists of today think deeply instead of clearly. One must be sane to think clearly, but one can think deeply and be quite insane. 
I just did some calculations and I've been able to determine that you're full of shit. 