Romantic partners and close friends might be more informed, because they’ve observed you more—but they can also have blurrier vision, because they chose you and often share that pesky desire to see you positively. You need people who are motivated to see you accurately. And I’ve come to believe that more often than not, those people are your colleagues. The people you work with closely have a vested interest in making you better (or at least less difficult). The challenge is they’re often reluctant to tell you the stuff you don’t want to hear, but need to hear.
Adam Grant writing in The Atlantic