“Is it fitting that our intelligence exert itself and labor in speculations which are not binding upon us, in fruitless argumentation, in laws which have no application to us, while we leave to habit and abandon to mechanical observance our great debt to our Creator?”

Source: Better-World Philosophy: A Sociological Synthesis (1899), The Social Ideal, pp. 159–160

Thoughts on Various Subjects (1727)

Preface
Culture and Anarchy (1869)

Variant: Such a simple concept, yet so true: that which we manifest is before us; we are the creators of our own destiny. Be it through intention or ignorance, our successes and our failures have been brought on by none other than ourselves.
Source: The Art of Racing in the Rain

Section 2 : Religion
Life and Destiny (1913)

Book Sometimes you win Sometimes you Learn

"On the Conservation of Force" (1862), p. 278
Popular Lectures on Scientific Subjects (1881)
Context: Every great deed of which history tells us, every mighty passion which art can represent, every picture of manners, of civic arrangements, of the culture of peoples of distant lands or of remote times, seizes and interests us, even if there is no exact scientific connection among them. We continually find points of contact and comparison in our own conceptions and feelings; we get to know the hidden capacities and desires of the mind, which in the ordinary peaceful course of civilised life remain unawakened.
It is not to be denied that, in the natural sciences, this kind of interest is wanting. Each individual fact, taken by itself, can indeed arouse our curiosity or our astonishment, or be useful to us in its practical applications. But intellectual satisfaction we obtain only from a connection of the whole, just from its conformity with law.

From The Declaration upon taking up Arms, before Congress, July 6th, 1775: as cited in A Conspectus of American Biography, Volume 1, ed. George Derby, J. T. White (1906), p. 239