"As above, So Below, As within, So without" is a saying in Wicca. This phrase comes from the beginning of The Emerald Tablet and embraces the entire system of traditional and modern magic which was inscribed upon the tablet in cryptic wording by Hermes Trismegistus.
The significance of this phrase is that it is believed to hold the key to all mysteries. All systems of magic are claimed to function by this formula. "'That which is above is the same as that which is below'...Macrocosmos is the same as microcosmos. The universe is the same as the God and Goddess, The God and Goddess is the same as man, man is the same as the cell, the cell is the same as the atom, the atom is the same as...and so on, ad infinitum. It means everything is connected.
"As within, so without" It means we have a divine creation inside of us and outside of us, it is our connection with nature and the universe. It is like the saying 'as you sow, so shall you reap'. This is also known as the Law of Cause and Effect or Karma. Whatever we put out in the Universe is what comes back to us. If what we want is happiness, peace, friendship, love…Then we should BE happy, peaceful, loving, a friend. Negative energy sent out to others will come back to you.