Predictably Irrational Revised And Expanded Edition: The Hidden Forces That Shape Our Decisions by Dan Ariely
"... we are not only irrational, but predictably irrational - that our irrationality happens the same way, again and again. Whether we are acting as consumers, businesspeople, or policy makers, understanding how we are predictably irrational provides a starting point for improving our decision making and changing the way we live for the better." (xx, Predictably Irrational, Dan Ariely) (emphasis added).
The question Ariely poses in the book is which circle is bigger; but ultimately it's a trick question. They are both the same size. The lesson in general is that relativity larger determines perception. The lesson, as it relates to a concept like success is the same, so be mindful of whom you are comparing yourself to. In social media fuelled world, where you can see every intimate detail of your extended network of friends, acquaintances and colleagues, its often easy to get so caught up in what other people are up to that you lose your bearings.