According to episode two of National Parks: America's Best Idea entitled The Last Refuge, John Muir had stated:
Nothing can be done well at a speed of 40 miles per day, far more time should be taken. Walk away quietly in any direction and taste the freedom of the mountain air. Climb the mountains and get their good tidings. Nature's peace will flow into you as sunshine flows into trees. The winds will blow their own freshness into you, and the storms their energy. Your cares will drop off like autumn leaves.
I like this.
Overall, Ken Burns' program National Parks: America's Best Idea tells an interesting story of the people involved in creating America's 50+ national parks. The partisan differences between the groups supporting and opposing the formation of the national parks is amazing. The terrorists who wanted to rape and pillage the pristine landscapes in the name of personal profit are in one corner while the preservationists in the other corner seemed to fight an uphill battle throughout their entire lives.
The winning battle cry of the preservationists is long term prosperity. The thought of future generations is one of the primary reasons for creating the land of the free in the first place (read Common Sense if you don't believe me), so it's reasonable to see why this argument would work to advance an unpopular agenda.
This brings up the current political environment concerning long discussions on the fight against terrorists, the fight for a better national health care policy, the fight for the control over broadcast medium (net neutrality, public wifi, et al), and the fight for control of space exploration. Whatever the case, we can only hope the primary concerns for any decisions that are made are for the rights of people who won't be born for another hundred years.
And concerning the choices to fill America with national parks during the last 150 years, I must say I am very pleased they decided to preserve the beauty of the nature because I am a BIG fan of the national parks.