subtile

Recent scientific discoveries have conferred upon man new powers of investigation, whereby nature has been made to reveal secrets so subtile that they never had been dreamt of before in philosophy.

From Scientific American ● Jan. 13, 2013

At Paris the Universe is seen, compos’d of Vortices of subtile Matter; but nothing like it is seen in London.

From "The Invention of Science" by David Wootton

Every one is the symbol of wisdom, and hath, in its malic acid, a subtile essence, which carries health to the morbid liver.

From A Breeze from the Woods, 2nd Ed. by William Chauncey Bartlett

We find doctors in the first ages speaking to us of God and the soul as material substances, more subtile indeed than ordinary bodies.

From Ecce Homo! A Critical Inquiry into the History of Jesus of Nazareth: Being a Rational Analysis of the Gospels by Paul Henry Thiry Baron d' Holbach

Man's daintiest care, & caution cannot spy The subtile point of his coy destiny, Wch way it threats.

From The Complete Works of Richard Crashaw, Volume I (of 2) by Richard Crashaw

No, his temperament needed a subtiler atmosphere than this, rarer essence than mere brutal freedom The East, the Old World, was his proper sphere for self-development.

From Margret Howth, a Story of To-day by Rebecca Harding Davis

Something keener than philosophy, subtiler than Epicurus, pricked Fred, as Minnie vanished into the cloud of snowflakes.

From The Atlantic Monthly, Volume 03, No. 18, April, 1859 by Various

We rather think that far subtiler things than the doctrine of association had from of old been familiar to him.

From Life of Robert Burns by Thomas Carlyle

It is the subtiler nature of doubt to penetrate the heart more profoundly than confidence, and to underlie it.

From Two Days' Solitary Imprisonment 1898 by Edward Bellamy

Gradually he wove a drama round it; line by line it took shape for a book that was to be subtiler, finer and more sincere than anything that he had ever written.

From The Education of Eric Lane by Stephen McKenna

This is a truth that takes all the sting out of Lord Bacon's observation that "against Atheists the very savages take part with the very subtilest philosophers."

From Flowers of Freethought (Second Series) by G. W. (George William) Foote

Said to us, during the past season, the subtilest thinker of Great Britain,—"I must send to America whatever I wish to put in print, unless I pay for its publication from my own pocket."

From The Atlantic Monthly, Volume 02, No. 12, October, 1858 by Various

At some far-away period in childhood it got imbedded in my fancy, and in process of time had acquired that subtilest, indefinable fascination which belongs only to imaginative reminiscence.

From The Atlantic Monthly, Volume 15, No. 88, February, 1865 by Various

He was the farthest reach of subtlety compatible with an individual self,--the subtilest of authors, and only just within the possibility of authorship.

From Beacon Lights of History, Volume 13 Great Writers; Dr Lord's Uncompleted Plan, Supplemented with Essays by Emerson, Macaulay, Hedge, and Mercer Adam by John Lord

It was this mastery of the interior life, this impassioned voicing of its subtilest secrets, that made Rousseau so irresistibly attractive to women.

From The Friendships of Women by William Rounseville Alger