You were happy just to be, before you gained any knowledge of the gratifications of this world. That unconditioned happiness has been lost due to gaining that knowledge, replaced by a conditioned happiness, which depends on dukkha, that is, conditioned states. This is called 'being DEFILED'. This practice of mindfulness removes defilement ("the fever of sense pleasures") and restores that original state. What will be after we die? Who knows, but I'd put my confidence in this dharma.
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You were happy just to be, before you gained any knowledge of the gratifications of this world. That unconditioned happiness has been lost due to gaining that knowledge, replaced by a conditioned happiness, which depends on dukkha, that is, conditioned states. This is called 'being DEFILED'. This practice of mindfulness removes defilement ("the fever of sense pleasures") and restores that original state. What will be after we die? Who knows, but I'd put my confidence in this dharma.