It is about practising Transcendental Meditation - written on their experience with Maharishi Mahesh Yogi who taught the Beatles to meditate at his ashram in India
'Jai Guru Dev' is a common greeting between those who practise tm to direct thanks to Maharishi's teacher Guru Dev
When we are truly present - at that moment nothing changes - change is in the past or the future, not the present
The present is where we find true peace and joy unencombered by thoughts or words.