"Finally, brothers, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is unpleasant to hear, all that is excellent or praiseworthy, think on these things."(Philippians 4:8)
The above verse confirms how important it is to fill your mind with positive things because it will have an impact in our lives. Mind we can determine our every word and action. If you have in mind we are positive things then good things will happen for us.
The Apostle Paul advises the mind of every believer is filled with things that are true, noble, just, pure, sweet, savory heard, virtuous (good) and all praiseworthy. To have a mind that is always positive no other way but must be obedient to the Word of God. This is what the Apostle Paul: "We are bringing every thought into captivity to the obedience of Christ" (2 Corinthians 10:5 b)