A valuable friend is one who'll tell you what you should be told, even if it offends you.
Why not upset the apple cart? If you don't, the apples will rot anyway.
A leading authority is anyone who has guessed right more than once.
If you find a path with no obstacles, it probably doesn't lead anywhere.
I think the next best thing to solving a problem is finding some humor in it.
The reason there's so much ignorance is that those who have it are so eager to share it.