Bob Brown, former Senator and Parliamentary Leader of the Australian Greens, is one of Australia's most thoughtful and recognised public figures. Since his retirement from public life in 2012, Bob has had time to consider the things that are truly important. One is the power of human thought to influence change and this book, the first time that Bob has spoken about his life since retirement, illustrates through his stories why he remains optimistic about the future.Optimism reflects on the simple things, the moments that are meaningful, and the big questions that have concerned Bob Brown. It is a powerful read as well as a meditation on the great and the small. Inspirational, compassionate and outraged, Bob's stories are rich with metaphor, entertaining and full of warmth. His stories reveal a complex man with a quick wit, a passion for activism and a joy for life.