From a magnificent speech by Robert Kennedy, Jr.:

...We don't know Michelangelo by reading his biography. We know him by looking at the ceiling of the Sistine Chapel. And we know our creator best by immersing ourselves in creation. And particularly wilderness, which is the undiluted work of the Creator.

And you know if you look at every one of the great religious traditions throughout the history of mankind, the central epiphany always occurs in the wilderness. Buddha had to go to the wilderness to experience self realization and nirvana. Mohammad had to go to a cave in the wilderness. Moses had to go to the wilderness of Mt. Sinai for 40 days alone to get the Commandments. The Jews had to spend 40 years wandering the wilderness to purge themselves of 400 years of slavery in Egypt. Christ had to go into the wilderness for 40 days to discover his divinity for the first time...

Read the entire speech: http://www.sierraclub.org/pressroom/rfkspeech/