I am a Bahá'í (which means I accept all the major religions) and we believe that the soul which manifests itself as the mind, lives for eternity. As your body obviously decomposes, if, during your life you only gain happiness by things to do with your body's appetites, then after death your mind will not be equipped to cope with life without your body and former material pastimes, and your existence will be very limited. However, if during you life you have found pleasure in learning and loving others, these things will stay with you. We often use the analogy of birth - if a baby does not develop limbs and organs in the womb, it will not be equipped to get the most out of life after it is born, but if it can think in the womb, it may wonder what they are for! Likewise after death, we do do not need the body but we still have our mind, our thoughts and feelings. Negative feelings will not be relevant as they all come down to greed, hatred etc which have their root in bodily desires, but our positive, or 'spiritual' thoughts will still exist in our minds and we will still have ways to express them, and continue an existence of discovery and helping others.