Life stays interesting due to interesting people.
Few days back, I asked one of my long acquainted colleague who is always chilled as ice but very slick in his work and his conversations, about his such cool attitude in life.
He replied: "I learned that from filling out simple forms in life to buying a car, laptop, smartphone, cable or house, ignore 'optionals'. I concentrate only on 'required'/'must needed' things. In college I never read optional articles/books/reads suggested by teachers but tried to concentrate and excel only on required topics. This keeps all clutters and headaches away - and a life simple".
(though I tried to argue with him about losing all joys in life without 'optionals', but was unable to convince him).