But in our ignorance we emotionalise joy, beauty and love. We make feelings of them, personal interpretations based on our old emotions. We put our personal past on the present with the result that joy, beauty and love don't seem to last. But it's our emotional substitutes that don't last and we become bored, discontented and unhappy again. The sensation or knowledge of joy, beauty and love is of course still there but it's overwhelmed by these coarser feelings.