Being too serious and having a strict plan in life can have its own drawbacks. Part of the excitement of life comes from spontaneous moments: job opportunities you stumble upon online, late-night invitations from your friends, a random book that you read that changes your perspective on the world. While reducing the uncertainty of the future definitely brings comfort, it also helps you miss out on the other great things that life has to offer. Having a healthy balance between serious and silly is the key to living a fulfilling life. We are human beings, after all, not human doings.