When you realize this state you are free from thoughts.
Then you are really free.
In this state nothing can influence you. You stop acting instinctively on the prompt of each passing thought. You become a completely conscious being, alive, strong, beyond everything.
You stay in this world. Your life continues, but you are beyond.
True peace of mind is the gate to Enlightenment.
Think of serenity of mind as a feasible possibility. Calm your mind by autosuggestions, meditation and concentration, and start enjoying peace of mind.