Wordsworth grew up in the beautiful lake area and was influenced by nature. His pure heart was easily moved by nature. This short poem is his 32-year-old work, with the rainbow as the image. The line 1-4 describes the emotion of jumping for joy at the sight of the rainbow since adulthood; Lines 4-6 emphasize this emotion and repeat the grammar "so it is it, so it is it, so it is it"; The sixth line uses short four-syllable sentences to express the emotional turning point and urgent mood that I hope this situation will last forever, otherwise I would rather die; In line 7, the child is the father of man, which is the eye of this poem, suggesting that the innocent heart of the child can be seen from an early age, but it is the father of an adult-inspiring adults to perceive nature; Lines 8-9 are not sure about the future and can keep an innocent heart (the joy of seeing the rainbow), so they only end with sincere prayers.
Children's innocence is innate, but it is also easy to get lost in the process of growing old, suppressed and polluted by reality and the world. Adults can only get a second innocence (rebirth) after exercise, which is the "alcohol truth". Because it is obtained after exercise, it is more valuable and less costly. The author of this poem did not mention how to keep a pure and innocent heart (that is not the poet's main task). Or many contacts with nature and literature and art are helpful.