"Man's Search for Meaning" by Viktor Frankl is a classic book that explores the psychological and spiritual aspects of finding meaning in life. Some key ideas from the book include:
The importance of finding meaning in difficult situations: Frankl argues that the human search for meaning is a fundamental aspect of our existence, and that even in the most dire circumstances, such as concentration camps, people can find meaning and purpose in their suffering.
The concept of "logotherapy": Frankl's therapeutic approach, which focuses on the search for meaning as the primary motivation in human life.
The idea that we have the freedom to choose our attitude in any given situation: Frankl argues that we have the ability to transcend our circumstances and find meaning in them, regardless of how dire they may be.
The power of hope: Frankl argues that hope is an essential ingredient in finding meaning in life, and that even the smallest glimmer of hope can sustain us in the darkest of times.
The importance of love and responsibility: Frankl asserts that love and responsibility are key elements in finding meaning in life, and that by taking responsibility for ourselves and others, we can transcend our circumstances and find purpose and meaning in our lives.
The meaning of life is not something that we can find, but something that we can create.
Please note that this is not an exhaustive list of key ideas, and the book Man's Search for Meaning is a deep and powerful read.