is there in our hearts ... when you fill your love with joy and happiness, why would not you wish for that to last forever?

When it's filled up with hatred, ignorance and sadness ... you feel that this whole world is really too small. Small to the degree that would make you feel that you don't belong there [and how can someone last that long in a place that he does not belong to?]

Do not dwell in the past, do not dream of the future, concentrate the mind on the present moment. (Gautama Buddha)