But in the proof of this great theorem two influences were neglected, either of which is fatal to its validity.
"A Text-Book of Astronomy"
George C. Comstock
The universal and eternal substance was to Spinoza, as philosopher, a theorem, and to Goethe, as poet, a perception and an emotion.
"The Approach to Philosophy"
Ralph Barton Perry
Barricades and street warfare have become a science, and the amount of resistance a half-armed populace can offer to a regular force is as much a matter of certainty as a mathematical theorem.
"The Martins Of Cro' Martin, Vol. II (of II)"
Charles James Lever