The online Cambridge Dictionary defines this phrase to mean you can only judge the quality of something after you have tried, used or experienced it.
Jesus told everyone that the way of the world was wrong over two thousand years ago. The proof of that is to just look around you and see how many of the people that go the way of the world, doing what is popular for the current time in their culture, leave a path of destruction in many ways. Jesus preached the gospel of love for one another.
It might be in following the current rhetoric telling people to live their dreams and in doing so, most of these people will fall to ruin. It may be the fact that most of the world is in it for themselves. Their lives revolve around them and what will benefit them, usually monetarily, for the moment. In our current American culture you can look at Wall Street, the banking industry, oil companies and all the multinational corporations that have one thing in common. They want to make as much money as possible and don’t care who or what they effect adversely.
This is not the way we are supposed to be spending our few seconds on this earth. We are supposed to be making the world better for being here, not destroying it under false delusions that we are providing jobs for others and making the way for a better tomorrow. At this pace, tomorrow really will never come.
We now have empty people who’s only desire is “doing their own thing” no matter who it hurts. They fill their emptiness with lies that are regularly streamed through all our varied media sources rigidly controlled by various governmental dictates instead of the ever “demonized” religion. Some use drugs, sex, work or other compulsive behavior to distract from the fact that they are frightened at the desolation of their very soul. There are many who say how horrible church is and that it is too controlling. In telling the truth, religion helps people learn to control themselves so that they no longer have to be rigidly controlled by other men with guns.