Infer the key themes in the text.
Input: Life is a journey of unique and often challenging experiences. Every journey is unique and every experience that is encountered can bring with it an opportunity to learn or grow.
The key themes in the text are the notion of Life as a Journey and the opportunities it presents for growth and learning.
The key themes in the text are: 1. The idea that life is an ongoing learning process; 2. That every journey is different and has its own set of challenges; 3. That every experience carries within it the chance to grow and develop personally.