“Dear Prudence” is a song written by John Lennon, and credited to Lennon–McCartney. It was released by the Beatles as the second track on their 1968 double-disc album entitled The Beatles, commonly known as The White Album. The subject of the song is Prudence Farrow, actress Mia Farrow’s sister, who was present when the Beatles went to India to study with Maharishi Mahesh Yogi.
John Lennon was asked to “contact her and make sure she came out more often to socialize”. As a result, Lennon wrote the song “Dear Prudence”. In the song Lennon asks Farrow to “open up your eyes” and “see the sunny skies” reminding her that she is “part of everything”. The song was said to be “a simple plea to a friend to ‘snap out of it'”. Lennon said later that “She’d been locked in for three weeks and was trying to reach God quicker than anyone else”.
Dear Prudence is me. Written in India. A song about Mia Farrow’s sister, who seemed to go slightly barmy, meditating too long, and couldn’t come out of the little hut that we were livin’ in. They selected me and George to try and bring her out because she would trust us. If she’d been in the West, they would have put her away.
– John Lennon