David mentions in Psalm 101 that he would not set before his eyes anything that’s worthless, and a perverse heart should be far from him. He knew well which truths to set before his eyes. In this age of information, we must also learn to choose which contents to put before our eyes. When we learn to guard our mind, our spirit can reach a new level. Colossians 3 teaches us to seek the things that are above. We really need to replace wrong thoughts with good ones, so that we can win the victory and be filled with enjoyment.