Emerald Tablet of Hermes Trismegistus, in the words "That which is Below corresponds to that which is Above, and that which is Above, corresponds to that which is Below, to accomplish the miracles of the One Thing".
In accordance with the various levels of reality: physical, mental, and spiritual, this relates that what happens on any level happens on every other. This is however more often used in the sense of the microcosm and the macrocosm. The microcosm is oneself, and the macrocosm is the universe. The macrocosm is as the microcosm, and vice versa; within each lies the other, and through understanding one (usually the microcosm) you can understand the other.
"The path up is the path down. The way forward is the way back. The universe inside is outside but the universe outside is inside." --Robert Anton Wilson
“Really, the fundamental, ultimate mystery -- the only thing you need to know to understand the deepest metaphysical secrets -- is this: that for every outside there is an inside and for every inside there is an outside, and although they are different, they go together.”-- Alan Watts quote
Gospel of Thomas (No. 3a):
If those who entice you say to you, ‘See, the kingdom is in heaven!’―then the birds of
heaven will be there before you. If they say to you, ‘It is in the sea!’―then the fishes will
be there before you. But the kingdom is within you―and without as well.
His disciples said to him: ‘When will the kingdom come?’ ‘It will not come when it is
expected. They will not say “See, here it is!” or “See, there it is!”―but the kingdom of the
Father is spread abroad on the earth and men do not see it’.12
“The wise men understood that this natural world is only an image and a copy of paradise. The existence of this world is simply a guarantee that there exists a world that is perfect. God created the world so that, through its visible objects, men could understand his spiritual teachings and the marvels of his wisdom.” --- The Alchemist, Paulo Coelho
"I've always liked reptiles. I used to see the universe as a mammoth snake, and I used to see all the people and objects, landscapes, as little pictures in the facets of their scales. I think peristaltic motion is the basic life movement. Swallowing,"
Jim Morrison quotes (American Poet and Singer. Member of the American band The Doors and one of rock music's mythic figures. 1943-1971)
“I’m an adventurer, looking for treasure.”
The Alchemist picked up a book that someone in the caravan had brought. Leafing through the pages, he found a story about Narcissus. The alchemist knew the legend of Narcissus, a youth who knelt daily beside a lake to contemplate his own beauty. He was so fascinated by himself that, one morning, he fell into the lake and drowned. At the spot where he fell, a flower was born, which was called the narcissus. But this was not how the author of the book ended the story. He said that when Narcissus died, the goddesses of the forest appeared and found the lake, which had been fresh water, transformed into a lake of salty tears. “Why do you weep?” the goddesses asked. “I weep for Narcissus,” the lake replied. “Ah, it is no surprise that you weep for Narcissus,” they said, “for though we always pursued him in the forest, you alone could contemplate his beauty close at hand.” “But...was Narcissus beautiful?” the lake asked. “Who better than you to know that?” the goddesses said in wonder. “After all, it was by your banks that he knelt each day to contemplate himself!” The lake was silent for some time. Finally, it said: “I weep for Narcissus, but I never noticed that Narcissus was beautiful. I weep because, each time he knelt beside my banks, I could see, in the depths of his eyes, my own beauty reflected.”
“What a lovely story,” the alchemist thought.
--- The Alchemist, Paulo Coelho
...As Within, So Without.
"Everything is everything. Everything contains everything. Everything is a part of everything else." --Micheal Glickman; p163, 2012 Pinchbeck