Read a recent interview with Pattie here:
I had already visited India and had found it incredibly spiritual and moving. I was keen to take up meditation and saw an advert for TM classes at Caxton Hall in London. A friend and I duly went along and, over a long weekend, we were initiated and given our mantras. I loved it and found that it worked for me on a number of levels—I felt “energized”, so I told George (Harrison) all about it at the earliest opportunity. He was interested and agreed to come along to see the Maharishi in London in August 1967. In fact, all four Beatles came along.
... I believe that George may have started work on Something whilst there and probably his songs which appeared on The White Album later in 1968. In its embryonic stages, While My Guitar Gently Weeps was a slower song with just George on his acoustic. I clearly remember Dear Prudence being sung by the boys to Prudence Farrow to try and entice her from her room at the ashram.