"How I Long to Feel That Summer in My Heart" is a poem that expresses a deep yearning for the warmth and joy associated with summer. The speaker reflects on the feelings of happiness, freedom, and vitality that summer brings, contrasting them with the colder, darker emotions of other seasons. The imagery in the poem evokes bright days, blooming flowers, and the carefree spirit of summer activities. Through this longing, the speaker conveys a desire to reconnect with those uplifting feelings, suggesting that the essence of summer is not just a season but a state of emotional well-being.