I learned from the Meditations of Marcus Aurelius that we just died today and whatever future time that may be given to us is a surplus. I used to think that death is a destination in the future that everyone must prepare for. After learning this new perspective, I realised that we are not living towards an end, but we are living away from the moment that have just died.
It was very deep and meaningful. The true happiness is in the now. Live moment by moment.