Clinging (or not) to pleasure

I just found this on this website: 

It is from Eknath Easwaran's Take Your Time: How to Find Patience, Peace, and Meaning.  I found it most intriguing. It is a follow up to a book I read- The Science of Happiness.  In that book, the evolution of happiness and pleasure is dissected, linking quite nicely to this quote.  Here it is.  I'll expand on it later.  

"To enjoy anything, we cannot be attached to it.  What we usually try to do is capture any joy that comes our way before it can escape.  We try to cling to pleasure, but all we succeed in doing is making ourselves frustrated, because, whatever it promises, pleasure simply cannot last.  But if I am willing to kiss the joy as it flies, I say, "Yes, this moment is beautiful.  I won't grab it.  I'll let it go."  And I live with a mind at peace and a heart untroubled.  Pleasure comes and goes.  When it goes, we don't need to cling to memories of the past happiness or dwell on when it may come again.  When we turn to the past yearning, we are running away from the present.  When we propel ourselves into the future in anticipation, we are running away from the present.  This is the secret of the world's spiritual tradition called detachment: If we don't cling to past or future we live entirely here and now, in 'Eternity's sunrise.'"