Identifying Tone in Adversity

Read the following excerpt from a book about overcoming adversity:

Excerpt: "In every challenge, there exists a glimmer of hope. It is easy to be consumed by despair, but I have found that resilience shines brightest in the darkest moments. Each setback is not a failure but a stepping stone to greater strength and wisdom."

Using the passage above, identify the tone the author conveys through their words.