"The Optimist" by E. M. Delafield is a work of fiction that tells the story of an extraordinary woman who became an ideal example of positive thinking for others. The main character, thanks to her optimism and energy, changes the lives and thoughts of other characters. This book encourages readers to see the world in color even in the darkest moments, emphasizing the importance of self-belief and the ability to see the world in a positive light. "Optimist" will leave you inspired and inspired to make positive changes in your life.