"The child is the father of Man" this famous line was written by

The correct answer is William Wordsworth.

Key Points

• "The child is the father of Man" is written by William Wordsworth.
• William Wordsworth used the expression, "The child is the father of the man" in his famous 1802 poem, "My Heart Leaps Up," also known as "The Rainbow."
• This quote has made its way into popular culture.
• Wordsworth uses the expression in a very positive sense, noting that seeing a rainbow produced awe and joy when he was a child, and he still felt those emotions as a grown man. 
• He hopes that these emotions will continue throughout his life, that he will retain that pure joy of youth.
• He also laments that he would rather die than lose that leap of the heart and youthful enthusiasm.