I like this from Robert Genn:

The way I look at it, the idea of renaissance has eight great principles that just might be worth thinking about:

Curiosity as a way of thinking
Suspicion of authority and conventional wisdom
Respect for intelligently filtered history
Aspiration to higher levels of achievement
Vision for renewed potential in all things
Tendency to invent private systems
Reinvention and perfection of former skills
Accepting the challenge of the difficult