It is not a question of sitting silently, it is not a question of chanting a mantra. It is a question of understanding the subtle workings of the mind. As you understand those workings of the mind a great awareness arises in you, which is not of the mind. That awareness arises in your being, in your soul, in your consciousness.
Meditation means how to be not a mind. How to be not a mind! Meditation means how to create the state of no-mindedness. It doesn't mean unconsciousness. It means conscious and still, without any disturbance in the consciousness; conscious with no ripples, with no waves, with no vibrations; conscious as a deep, calm, silent pool with no ripples on it, with no disturbances on the surface; just a calm silent pool with no breeze to disturb, just mirrorlike.
There is a difference. You watch television, you don't witness it. But, while watching television, if you start witnessing yourself watching television, then there are two processes going on: you are watching television, and something within you is witnessing the process of watching television. Witnessing is deeper, far deeper. It is not equivalent to watching. Watching is superficial. So remember that meditation is witnessing.
A man of meditation functions differently. Whatever profession he chooses, it does not matter. He will bring to his profession some quality of sacredness. He may be making shoes, or he may be cleaning the roads, but he will bring to his work some quality, some grace, some beauty, which is not possible without samādhi.