Turn on, tune in, drop out

Turn on, tune in, drop out is a phrase made famous by Timothy Leary. It means to begin experimenting with psychedelic drugs, "tune in" to the inner thoughts and feelings that may come about as a result, and then "drop out" of society to explore these new insights. It's an idea that has been wildly controversial, but it encourages people to think differently and explore the power of their own minds.