" It is because of serotonin that a college graduate feels a sense of pride and feels their confidence and status rise as they walk across the stage to receive their diploma. Technically, all a student needs to graduate is to pay their bills, fulfill their requirements and collect enough credits. But graduation probably wouldn’t feel the same if we received only an e-mail with a generic letter of congratulations and a downloadable attachment of the diploma.

And here’s the best part. At the moment that college graduate feels the serotonin course through their veins as they receive their diploma, their parents, sitting in the audience, also get bursts of serotonin and feel equally as proud. And that’s the point. Serotonin is attempting to reinforce the bond between parent and child, teacher and student, coach and player, boss and employee, leader and follower. "

― Simon Sinek , Leaders Eat Last