When we sit in meditation, we cease some of the restless moving of the mind, even if briefly. These periods of rest and ease switch off the grasping mind which always wants more. We stop, and realize that happiness is already available.
In the Buddha’s time there lived a killer called Angulimala… When Angulimala had one last victim to kill, he saw the Buddha coming down the road. Angulimala ran toward the Buddha with his sword, with the intent to kill his last victim and complete his task. The Buddha was walking slowly and it seemed Angulimala would have no difficulty in finishing him off, but the young man found that he could not catch up to the master, even though the Buddha appeared to not be moving at all. Angulimala finally called out to the Buddha in frustration, “Stop!”. The Buddha replied “Angulimala I have already stopped for the sake of all beings. It is you who has not stopped”
Angulimala was so moved that he abandoned his ways and became a monk…Soon he became an arhat, a liberated person, and entered nirvana.
Guo Gu, Silent Illumination