Jeremiah 1:9, 10 (NKJV)
One of the greatest challenges we will ever face is with our thoughts. Many people have wrong thoughts and wrong beliefs based on those thoughts that are causing them to be ineffective in what they do. For example, you may think that you are not able to succeed in life or you may think you are not the kind of person who can do anything great for God. Thinking like this leads to wrong decisions and wrong actions, which will hold you back and hinder you from doing what you need to do. To change our life we must change our thinking.
God told Jeremiah that He had put His Words in his mouth, this is a good thing for us as well; we need to say what God has said in His Word. Next God told Jeremiah to root out, pull down, destroy, throw down, build, and plant. Notice that God talked twice as much about getting rid of some things as He did about adding some things. Sometimes we have to remove the wrong thoughts before we can build and plant the right thoughts. It would be like pulling all the weeds out of your garden before planting the flowers. To make room for one you have to get rid of the other.
What we think is based on the information we have received, the question is if the information is actually good. Our beliefs, actions, and the words we speak are based on the things we think about. If we find ourselves having the wrong kinds of thoughts then we need to remove those thoughts and replace them with thoughts that we find in the Bible. We have the choice as to what we will think about, it is up to us. We need to choose to think about the right kinds of things and weed out the wrong kinds of things; this will help us to live the kind of life that God wants us to live.