In human life, wisdom is more important than cleverness. Cleverness is like having a library full of books. Wisdom is knowing which book to read at this moment. Wisdom is always open to the power of new possibilities. Wisdom means accepting that other people view the world differently - and not necessarily wrongly. Wisdom is based on confidence, not arrogance. Wisdom also means: worth and using emotions to guide us in life, and not letting them chain us. Wisdom requires creativity. Like humor, creativity is based on making unexpected associations (which seem so obvious in retrospect), and the first step towards wisdom may well be: being able to laugh. This book provides an overview of thinking tools and guidelines and principles of wisdom.