While there is a grain of truth there...I've met some people who change plans every week...and some plans sound so far-fetched it's difficult to support them.
While it can be difficult to summon up enthusiasm for every idea...but I still do my best to support the person's basic premise...
What you'll mostly hear from people is their justification for the decisions they've made. Most of us have been, or will be, given the chance to pursue some form of greatness. How we respond to that opportunity has big effects on our lives, so we rarely stop defending the decision we make, and most of us aren't even consciously aware of it when we're doing it, because we never experience what might have been, only what was.
If someone rose to the challenge and are now successful, they'll tell you to never give up, because they know what it's like to reach the other end of the tunnel. In their experience, pursuing success means attaining it. If they've shrunk from the challenge and are now living an existence that deep down, they know is less than it could be, they'll never stop trying to convince themselves it was the right decision, and as such, they'll try to convince others it's approach they should take too.
Love is the opposite of fear, bravery is being terrified and doing it anyway