profound thought

References in classic literature ?
upon the painted face of his assassin an expression of tranquil and profound thought, as in the solution of a problem in chess
When he had a particularly profound thought upon the science of war he always unconsciously addressed himself to the youth.
It was a time of profound thought and sudden revelations for more than one couple, and several single people.
The marquise lighted the candles, inhaled the perfume of the flowers, sat down, and was soon plunged in profound thought.
At the time, I devoted three days to the studious digesting of all this beer, beef, and bread, during which many profound thoughts were incidentally suggested to me, capable of a transcendental and Platonic application; and, furthermore, I compiled supplementary tables of my own, touching the probable quantity of stock-fish, etc.
No, it is the neat thing to say you were reluctant, and then append the profound thoughts that "struggled for utterance," in your brain; but it is the true thing to say you were not reluctant, and found it impossible to think at all--though in good sooth it is not respectable to say it, and not poetical, either.
According to the Cannabis Consumers Campaign, when using cannabis, "People often get a new perspective on a familiar scene or problem, a seemingly profound thought or burst of creativity.
The story is told about an occasion when Barth was asked, "What is the most profound thought that ever entered your mind?
GREAT teachers do not teach, they simply inspire" -- this sounds like a profound thought from a wise man.
Humour, ingenuity and profound thought, three reasons why Crash Baggage gets a mention here.
Their quietness that would give them an air of detachment intimidated me and gave me the impression they were engaged in profound thought.