"I don't know," one of the hardest three letter sentences to say in English[1], one of the most important to say, as well as one of the most rewarding (time to

"I don't know," one of the hardest three letter sentences to say in English[1], one of the most important to say, as well as one of the most rewarding (time to learn). I don't think it's about a lack of confidence, it's just awareness about how far your knowledge extends and honesty surrounding that. [1]: http://www.amazon.com/dp/0062218336 http://www.amazon.com/dp/0062218336