“It began in mystery, and it will end in mystery, but what a savage and beautiful country lies in between.”

Source: Skulduggery Pleasant

The Saviors of God (1923)
Context: I do not care what face other ages and other people have given to the enormous, faceless essence. They have crammed it with human virtues, with rewards and punishments, with certain ties. They have given a face to their hopes and fears, they have submitted their anarchy to a rhythm, they have found a higher justification by which to live and labor. They have fulfilled their duty.
But today we have gone beyond these needs; we have shattered this particular mask of the Abyss; our God no longer fits under the old features.
Our hearts have overbrimmed with new agonies, with new luster and silence. The mystery has grown savage, and God has grown greater. The dark powers ascend, for they have also grown greater, and the entire human island quakes.
Let us stoop down to our hearts and confront the Abyss valiantly. Let us try to mold once more, with our flesh and blood, the new, contemporary face of God.
For our God is not an abstract thought, a logical necessity, a high and harmonious structure made of deductions and speculations.
He is not an immaculate, neutral, odorless, distilled product of our brains, neither male nor female.
He is both man and woman, mortal and immortal, dung and spirit. He gives birth, fecundates, slaughters — death and eros in one — and then he begets and slays once more, dancing spaciously beyond the boundaries of a logic which cannot contain the antinomies.

" The Life and Teachings of Thoth Hermes Trismegistus http://magdelene.net/Thoth%20Hermes%20Trismegistus.htm", in The Secret Teachings of All Ages (1928) by the Canadian occultist Manly Hall; a few quotation websites credit this to Addison.
Misattributed

Source: Son of a Witch

Table-Talk (1857)
Context: Round about what is, lies a whole mysterious world of might be, — a psychological romance of possibilities and things that do not happen. By going out a few minutes sooner or later, by stopping to speak with a friend at a corner, by meeting this man or that, or by turning down this street instead of the other, we may let slip some great occasion of good, or avoid some impending evil, by which the whole current of our lives would have been changed. There is no possible solution to the dark enigma but the one word, "Providence".

Source: Broken Verses

“Confusing ‘Character’ with ‘Temperament’”
Clearing the Ground (1986)
Context: The core in the mystery of what we call personality resides in the individual mix between character and temperament. The most successful personalities are those who achieve the best balance between the strict demands of character and the lenient tolerance of temperament. This balance is the supreme test of genuine leadership, separating the savior from the fanatic.
The human Jesus is, to my mind, the ultimate paradigm of such psychic equilibrium. He was absolutely hard on himself and absolutely tender toward others. He maintained the highest criteria of conduct for himself but was not priggish or censorious or self-righteous about those who were weaker and frailer. Most persons of strength cannot accept or tolerate weakness in others. They are blind to the virtues they do not possess themselves and are fiercely judgmental on one scale of values alone. Jesus was unique, even among religious leaders, in combining the utmost of principle with the utmost of compassion for those unable to meet his standards.
We need to understand temperament better than we do and to recognize its symbiotic relationship to character. There are some things people can do to change and some things they cannot do — character can be formed, but temperament is given. And the strong who cannot bend are just as much to be pitied as the weak who cannot stiffen.

This is My God: The Jewish Way of Life (1959)