I guess what you therapist is trying to say is whatever it is that weighs us down... whether its anger, envy, jealousy or physical pain...
With the right mind-set you can go a long way to negate it, you can take control, rather than be a slave to it...
We'd all like the perfect life, the perfect start, a great job, house car, partner family etc...but the reality all of this at best can only be temporary.... doesn't stop us striving for it though does it?

And therein lay the demons...
Oft we're happier when our dreams remain just so. Sometimes when we achieve our goals when suddenly all we've really hoped for is made real, we get the thing... what we really find is the results not so thrilling after all. Oh dear? Life's not quite so amazing and fabulous after all.... and the dream was in fact more fulfilling than the reality.
This can be devastating and explains why rock-stars, celebrities and people like Marilyn Monroe take their lives...
Having it all can be way more empty, shallow and meaningless than what you might imagine.....
Or ever dream of....
Which is where that saying comes from 'if you really love somebody – set them free'