“It is Allah Who has sent down the Book in Truth, and the Balance.”
Holy Qur’an (42:17)
“And the Firmament has He raised high, and He has set up the Balance, In order that you may not transgress (due) balance. So establish weight with justice and fall not short in the balance.”
Holy Qur’an (55:7-9)
The principle of “Adl” is generally described as the belief that Allah is Just. He will reward or punish any person according to his deeds. The word “Adl” was originally coined to convey the idea of “making two things equal”. The idea of equal distribution leads to “Equity” or “Justice”. And, as a result, “Adl” came to denote “Justice”, “Equity”, “to be of exact standard neither less nor more, and “to keep everything in its proper place”.
However, this major principle of Islam has to be valued at a deeper level to manifest its true meaning. If we consider the universe, it is easy to see how perfectly balanced the planets are around the sun, each in its own orbit, and even how balance prevails in the galaxies. As a part of the universe, we too, follow the laws of existence, and strive to maintain balance. Balance and equilibrium ensure stability, and are the result of the existence of a constant center. 
“Certainly We sent Our messengers with clear arguments, and sent down with them the Book and the Balance that men may conduct themselves with equity.”
Holy Qur’an (57:25)
Hazrat Salaheddin Ali Nader Angha, Pir Oveyssi, teaches that each human being is a true and comprehensive unit of Existence, and therefore the source of balance and harmony is inherently within him. Discovery of the “I”, provides him with a constant measure (Mizan) to avoid extremes and nurture the physical as well as spiritual aspects of his life. The Source of Life within the heart is the point of balance which enables us to bring “Adl” – balance – to our life in its totality.
“Equilibrium of absorptions is the point of freedom.” 
“The concentration of dispersed energies and potencies in the center of the heart provides harmony and equilibrium. This way, we can access our lost spiritual dimension, and rediscover our source of balance and tranquility.” 
- Molana Salaheddin Ali Nader Angha, Theory “I” (Riverside, CA: M.T.O. Publications®, 2002) pp.103-105
- Molana Salaheddin Ali Nader Angha, The Secret Word (Lanham, MD: University Press of America, 1989) p.20
- Molana Salaheddin Ali Nader Angha, Theory “I” (Riverside, CA: M.T.O. Publications®, 2002) p.160