What is the mood of poem The Lesson by Roger McGough?

The poem "The Lesson" by Roger McGough presents a thoughtful and reflective mood. It explores the concepts of life's lessons and experiences and the growth they bring. The poem's tone is contemplative, as the speaker considers the challenges, both positive and negative, faced throughout life. The overall atmosphere is one of acceptance, appreciation, and a sense of wisdom gained from the lessons learned along the way.