"If your understanding of the Christian faith can be summed up on a bumper sticker, printed on a tee shirt, or could make its way on to a Hallmark greeting card, you could be in a very dangerous place." (Nathan W. Bingham, found here.)
Sometimes simple is good. And when it comes to faith, I think we all start out simple. So the above quote does not apply as much to those new to the faith. But we are told not to be eternal milk drinkers. There is an expectation that we will mature in that faith. I would even go so far as to say it is something that we should strive for.
That is a problem for some, who get stuck in a denominational or other type of mindset, thinking they have it all figured out and in essence, getting stuck in the mud. As my mother-in-law would say, doing the same old six and seven. But God's word is living and active.
I say this as much for me as for anyone who might read this. I like to be right. Problem is, that I am only sometimes right. Hard to say how much. So I need to be aware of over-simplifying, and holding on to what I believe instead of holding on to truth.