"And this I pray, that your love may abound yet more and more in knowledge and in all judgement; That ye may approve things that are excellent;..." Phillipians 1:9-10a
God is not talking about carnal knowledge here. Just gaining knowledge is of no consequence, but gaining godly knowledge is. Gaining knowledge about how God operates among His people and what you can do to be and stay in the will of God is the kind of knowledge that will bring good judgement. The knowledge of the holy brings many blessings. The blessings are released as the gems of truth are discovered through perseverance in the faith.
If you have been in church for thirty years and you still don't understand or believe in your heart the fundamental truths provided in the stories in scripture, you have not abounded in knowledge, you've stagnated. You are not ready for the onslaught of a wicked enemy, you might fall prey to his tactics, because you are not prepared. As time passes by you should know more about the things of God than before. You should be able to speak to God and hear clearly His voice answering you. You should know how to go into the presence of God and how to activate your faith in crisis. You should be thanking God in the mountain top experiences and following God's leading in the catastrophes of life. You should know where to turn. You should know how to pray and how to receive from God.
God wants you to approve the things that are excellent and by default disapprove of the things that are not excellent. We have a generation of talented men and women that still approve things that are not excellent. They still allow wickedness to enter into their households through TV and video games, the Internet and books. Of course TV and video games the Internet and books in themselves are not evil. They are simply devices that transport information, but the information that is allowed to come into your home, your life, should be monitored for godly quality content.
I wonder why this is such a topic of great contention. I have had many Christian men and women tell me that it doesn't make any difference what they watch or what they see on the Internet as long as it doesn't hurt anyone else. That's the argument of a weak man or woman, that still gets their ya yas from carnal sources. There is better and there is a more excellent way. Seeing what is pure and beautiful, looking upon God's creation in awe, demanding more from your network, not participating with every whim that passes by, all reveal that you are seeing a more excellent way.
I think we all owe it to God to go through a purifying process at least as long as we have allowed the entrance of ungodly influences in our life. It doesn't take long, once you draw a line in the sand about your position to stand for Christ, that you will see great results, in your own life and many of those around you.