Keeping a journal is s good idea for a number of reasons. First and foremost it helps us to articulate our thought and goals. Everyone wants to be happy but happiness can seem elusive. Keeping a happiness journal is helpful for three reasons. 1. It is a useful way of setting happiness goals. 2. It is a useful tool for reflecting on what makes us happy and unhappy. 3. It helps us to remember the experiences in our lives that were happy and pleasant.