A man has tens of thousands of thoughts in mind from the moment when he gets up till he goes to bed. A study by American psychologist Shad Helmstetter shows that most of them are negative thoughts like anxiety or worry and that few are positive thoughts.
Negative thoughts do not spring up from the beginning. When distracting thoughts are left alone in your head, they naturally flow in a negative way. A person who easily feels bored even for a good thing, comes to incline toward a negative way unconsciously as time passes by according to the habit of brain that accepts negative things more actively. So experts say that we need to make efforts in order to have positive thinking.
We have a way to keep our minds from flowing in a negative direction. It is to study the Word of God always. Then good and beautiful thoughts that God gives us will follow on the heels of another. If it is led to a prayer of thanksgiving, God will keep our hearts and minds safe and make us have no worries.
Do not be anxious about anything, but in everything, by prayer and petition, with thanksgiving, present your requests to God. And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus.Php 4:6–7