Matter is but the perpetual communion and separation of particles. The body has all its component cells replaced by 'new' ones during every seven-year period of time. Therefore, how can we pronounce anything as stable, permanent, true? This is the reason why man does not get contentment and peace. This is the reason why man does not get joy, however wealthy or famous he may become. So long as he revels in the trivial and the temporary, he cannot be happy. It is only when he has discovered the Atman, and is always deep in the ecstasy of that discovery, that he can be in unblemished happiness. In that stage, he is aware that he is eternal, all-knowing, absolute and omniscient.
divinely sent