Bhagavad Gita Class, Ch. 2 . v.13 given by 7 years old Radha Padma Devi dasi (8 min video)
Srila Prabhupada: Always remember Krishna Who is your dear most friend and always serve Him just to please Him, and He will give you all intelligence how to be a first-class devotee. Letter to Mr. DDD, March 3, 1970.
Watch it here: https://goo.gl/J7NdfO