profound thought

References in classic literature ?
When he had a particularly profound thought upon the science of war he always unconsciously addressed himself to the youth.
The dull, sleepy expression was no longer there, nor the affectation of profound thought. The round, steady, hawk's eyes looked before him eagerly and rather disdainfully, not resting on anything although his movements were still slow and measured.
The marquise lighted the candles, inhaled the perfume of the flowers, sat down, and was soon plunged in profound thought. Her deep musings, melancholy though they were, were not untinged with a certain vague joy.
Guided by the infernal hubbub, I sprang to the rescue of my friend, but had hardly taken a stride in the darkness when the whole room blazed with a blinding white light that burned into my brain and heart and memory a vivid picture of the combatants on the floor, Moxon underneath, his throat still in the clutch of those iron hands, his head forced backward, his eyes protruding, his mouth wide open and his tongue thrust out; and--horrible contrast!--upon the painted face of his assassin an expression of tranquil and profound thought, as in the solution of a problem in chess!
If the conversation turned on science or history, he was wont to become thoughtful, and to confine his share in it to little approving nods, like a man who by dint of profound thought has arrived at scepticism.
But the stage-manager, holding his chin in the hollow of his right hand, which is the attitude of profound thought, said:
It was a time of profound thought and sudden revelations for more than one couple, and several single people.
Burdovsky silently resumed his seat, and bent his head as though in profound thought. His friend, Lebedeff's nephew, who had risen to accompany him, also sat down again.
Thence he drove to Scotland Yard, but, instead of entering, he sat in his cab with his brows drawn down, lost in profound thought. Finally he drove round to the Charing Cross telegraph office, sent off a message, and then, at last, we made for Baker Street once more.
The Prince surveyed his progress for a time, and then went towards the Parting of the Waters and stood with folded arms gazing upstream in profound thought. The bird-faced officer came up to Bert, heavy with a sentence in English.
They followed the road with a sensation that they were soaring along in a supporting medium, possessed of original and profound thoughts, themselves and surrounding nature forming an organism of which all the parts harmoniously and joyously interpenetrated each other.
Sometimes when the cardinal, always on horseback, like the lowest GENDARME of the army, cast a pensive glance over those works, so slowly keeping pace with his wishes, which the engineers, brought from all the corners of France, were executing under his orders, if he met a Musketeer of the company of Treville, he drew near and looked at him in a peculiar manner, and not recognizing in him one of our four companions, he turned his penetrating look and profound thoughts in another direction.