“I do not consider myself a philosopher. I am a biologist, attempting to grapple with the Schrodinger question, “What is Life?” It turns out that this is not an empirical question, to be resolved through observation in a laboratory.”

Autobiography of Values (1978)
Context: I know myself as mortal, but this raises the question: "What is I?" Am I an individual, or am I an evolving life stream composed of countless selves? … As one identity, I was born in AD 1902. But as AD twentieth-century man, I am billions of years old. The life I consider as myself has existed though past eons with unbroken continuity. Individuals are custodians of the life stream — temporal manifestations of far greater being, forming from and returning to their essence like so many dreams. … I recall standing on the edge of a deep valley in the Hawaiian island of Maui, thinking that the life stream is like a mountain river — springing from hidden sources, born out of the earth, touched by stars, merging, blending, evolving in the shape momentarily seen. It is molecules probing through time, found smooth-flowing, adjusted to shaped and shaping banks, roiled by rocks and tree trunks — composed again. Now it ends, apparently, at a lava brink, a precipitous fall.
Near the fall's brink, I saw death as death cannot be seen. I stared at the very end of life, and at life that forms beyond, at the fact of immortality. Dark water bent, broke, disintegrated, transformed to apparition — a tall, stately ghost soul emerged from body, and the finite individuality of the whole becomes the infinite individuality of particles. Mist drifted, disappeared in air, a vanishing of spirit. Far below in the valley, I saw another river, reincarnated from the first, its particles reorganized to form a second body. It carried the same name. It was similar in appearance. It also ended at a lava brink. Flow followed fall, and fall followed flow as I descended the mountainside. The river was mortal and immortal as life, as becoming.

RS. Issue 858/859.

Section 15 (p. 72; Dr. Auberson, then HARLIE)
When HARLIE Was One (1972)

Interview at Brown's official site http://www.danbrown.com/novels/davinci_code/faqs.html
Context: Interestingly, if you ask three people what it means to be Christian, you will get three different answers. Some feel being baptized is sufficient. Others feel you must accept the Bible as absolute historical fact. Still others require a belief that all those who do not accept Christ as their personal savior are doomed to hell. Faith is a continuum, and we each fall on that line where we may. By attempting to rigidly classify ethereal concepts like faith, we end up debating semantics to the point where we entirely miss the obvious — that is, that we are all trying to decipher life's big mysteries, and we're each following our own paths of enlightenment. I consider myself a student of many religions. The more I learn, the more questions I have. For me, the spiritual quest will be a life-long work in progress.

Source: Love, Sexuality and Matriarchy: About Gender

Source: Demian (1919), p. 9 Prologue
Context: I do not consider myself less ignorant than most people. I have been and still am a seeker, but I have ceased to question stars and books; I have begun to listen to the teachings my blood whispers to me. My story is not a pleasant one; it is neither sweet nor harmonious, as invented stories are; it has the taste of nonsense and chaos, of madness and dreams — like the lives of all men who stop deceiving themselves.
Each man's life represents the road toward himself, and attempt at such a road, the intimation of a path. No man has ever been entirely and completely himself. Yet each one strives to become that — one in an awkward, the other in a more intelligent way, each as best he can.

Since "the answers of the special sciences" do not reach "the horizon of total reality", they are given "without having to speak at the same time of 'God and the world.'" (p. 96)
Source: Leisure, the Basis of Culture (1948), The Philosophical Act, p. 95

citation needed
From his various literature