“I presume that to the uninitiated the formulae will appear cold and cheerless; but let it be remembered that, like other mathematical formulae, they find their origin in the divine source of all geometry.”

Lecture XX, "Conclusions"
1900s, The Varieties of Religious Experience (1902)
Context: Religion must be considered vindicated in a certain way from the attacks of her critics. It would seem that she cannot be a mere anachronism and survival, but must exert a permanent function, whether she be with or without intellectual content, and whether, if she have any, it be true or false.
We must next pass beyond the point of view of merely subjective utility, and make inquiry into the intellectual content itself.
First, is there, under all the discrepancies of the creeds, a common nucleus to which they bear their testimony unanimously?
And second, ought we to consider the testimony true?
I will take up the first question first, and answer it immediately in the affirmative. The warring gods and formulas of the various religions do indeed cancel each other, but there is a certain uniform deliverance in which religions all appear to meet. It consists of two parts: —
1. An uneasiness; and
2. Its solution.
1. The uneasiness, reduced to its simplest terms, is a sense that there is something wrong about us as we naturally stand.
2. The solution is a sense that we are saved from the wrongness by making proper connection with the higher powers.

Appendix 1, Handbooks and formulae
Structures (or, Why Things Don't Fall Down) (1978)

Introduction (p. 3)
A Mathematician Reads the Newspaper (1995)

The Foundations of Mathematics (1925)

Dear Boullée

Source: The End of the Affair

The Mysterious Universe (1930)

The evolutionary modification of genetic phenomena. Proceedings of the 6th International Congress of Genetics 1, 165-72, 1932.
1930s

The Evolution of Physics (1938) (co-written with Leopold Infeld)
1930s