“All that happens in the world of Nature or Man, — every war; every peace; every hour of prosperity; every hour of adversity; every election; every death; every life; every success and every failure, — all change, — all permanence, — the perished leaf; the unutterable glory of stars, — all things speak truth to the thoughtful spirit.”

Variant: Every adversity, every failure, every heartache carries with it the seed of an equal or greater benefit.
Source: Think and Grow Rich: The Landmark Bestseller - Now Revised and Updated for the 21st Century

In Search of the Miraculous (1949)

Martin Pippin in the Apple Orchard (1922)

Source: Studies in Nature and Literature

Book II, ch. 4 (trans. Constance Garnett)
The Elder Zossima, speaking to Mrs. Khoklakov
The Brothers Karamazov (1879–1880)

Book II: The City, Ch. IV
Casuals of the Sea (1916)

Introductio ad prudentiam: Part II (1727), Gnomologia (1732)

1840s, Essays: First Series (1841), Compensation
Context: The universe is represented in every one of its particles. Every thing in nature contains all the powers of nature. Every thing is made of one hidden stuff; as the naturalist sees one type under every metamorphosis, and regards a horse as a running man, a fish as a swimming man, a bird as a flying man, a tree as a rooted man. Each new form repeats not only the main character of the type, but part for part all the details, all the aims, furtherances, hindrances, energies, and whole system of every other. Every occupation, trade, art, transaction, is a compend of the world, and a correlative of every other. Each one is an entire emblem of human life; of its good and ill, its trials, its enemies, its course and its end. And each one must somehow accommodate the whole man, and recite all his destiny.
The world globes itself in a drop of dew.