'If a man know this here, that is the true (end of life); if he does not know this here, then there is great destruction (new births). The wise who have thought on all things (and recognised the Self in them) become immortal, when they have departed from this world.'

In plain words: Knowing Brahman in this life is the true goal of living. If you don't, you face great loss and must be born again and again, but the wise who see the Self in all things become immortal after death.