Self-restraint
Daman is self-restraint, not suppression. This word daman has been very wrongly used. It is not suppression; it is self-restraint. And there is a deep difference.
While doing meditation, while standing in silence, you may feel a sneeze coming. You can suppress it, you can start fighting with it, then it is suppression. But if you simply remain indifferent, if you do not do anything about it, if you do not suppress and you do not express, if you do not do anything about it and you simply remain indifferent, this is self-restraint. You remain in yourself. You don’t move towards the sneeze to do anything.
If you move to express it, you have come out of yourself. If you move to suppress it, again you have come out of yourself. You simply remain in yourself as if the sneeze is happening to someone else – you are not concerned. You don’t suppress it, you don’t fight with it. You simply remain indifferent, a witness. That is self-restraint.
Suppression is easy because you are allowed to do something. Self-restraint is very difficult because you are not allowed to do anything. You are to remain passive, a non-doer, non-active, simply watching.
-Osho, "The Supreme Doctrine, #16"