"You gotta serve somebody" -- Bob Dylan
"Men are not free when they are doing just what they like. The moment you can do just what you like, there is nothing you care about doing" -- D.H. Lawrence
"Safe?...Who said anything about safe? 'Course he isn't safe, but he's good. He's the King, I tell you." -- Mr. Beaver in 'The Lion, the Witch, and the Wardrobe'.
And in honour of going back to school:
"Education is the best provision for old age." -- Aristotle
"Only the educated are free." -- Epictetus
"The very spring and root of honesty and virtue lie in good education." -- Plutarch
[additions welcome as always]