“It is the great glory as well as the great threat of science that everything which is in principle possible can be done if the intention to do it is sufficiently resolute.”

Kant's Inaugural Dissertation (1770), Section V On The Method Respecting The Sensuous And The Intellectual In Metaphysics

As quoted from his Letters, in Hankins, Frank Hamilton. 1908. "Adolphe Quetelet as Statistician." Columbia University, Longmans, Green & Company, agents, Chapter IV https://www.ischool.utexas.edu/~wyllys/QueteletResources/HankinsQueteletChap4.pdf. p. 99
Context: This great body (the social body) subsists by virtue of conservative principles, as does everything which has proceeded from the hands of the Almighty... When we think we have reached the highest point of the scale we find laws as fixed as those which govern the heavenly bodies: we turn to the phenomena of physics, where the free will of man is entirely effaced, so that the work of the Creator may predominate without hindrance. The collection of these laws, which exist independently of time and of the caprices of man, form a separate science, which I have considered myself entitled to name social physics.

Source: Guide for the Perplexed (c. 1190), Part III, Ch.11

Although under a heavy fire for several continuous hours I received only one wound, the breaking of the longest finger of my left hand; but the doctor says the finger may be saved. It was broken about midway between the hand and knuckle, the ball passing on the side next to the forefinger. Had it struck the centre, I should have lost the finger. My horse was wounded, but not killed. Your coat got an ugly wound near the hip, but my servant, who is very handy, has so far repaired it that it doesn't show very much. My preservation was entirely due, as was the glorious victory, to our God, to whom be all the honor, praise, and glory. The battle was the hardest that I have ever been in, but not near so hot in its fire.
Letter to his wife after the First Battle of Bull Run (22 July 1861); as quoted in Memoirs of Stonewall Jackson by His Widow Mary Anna Jackson (1895) http://books.google.com/books?id=bG2vg5cH004C, Ch. XI : The First Battle of Manassas, p. 178

Speech at the 50th session of the United Nations General Assembly (excerpts) (1995)

Preface.
A History of Science Vol.1 Ancient Science Through the Golden Age of Greece (1952)
Context: My main interest... is the love of truth, whether pleasant or not. Truth is self-sufficient, and there is nothing to which it can be subordinated without loss. When truth is made subservient to anything else, however great (say religion), it becomes impure and sordid.

Small Houses: Their Economic Design and Construction (1922)
Context: Why can there not be a new art founded on the only principle which can produce great art—the principle that art is the interpretation or extraction of the essence of beauty in nature, and all else is secondary?<!-- Introduction

Source: A Treatise On Political Economy (Fourth Edition) (1832), Introduction, p. xlvii