Final answer:
In the Introduction to Songs of Innocence by William Blake, he states that he is writing songs reflective of the innocence and joy of childhood, as opposed to the more mature themes in his later work, Songs of Experience.
Step-by-step explanation:
In the Introduction to Songs of Innocence, William Blake states that he is writing songs of a pleasant and joyful nature, illustrating the innocence and purity of childhood. This stands in contrast to the companion collection Songs of Experience, where he writes more somber and mature themes. Blake's work is often noted for its exploration of these dual states of the human psyche and his commentary on social issues through poetic means.