In this world, we will have many troubles. This is to remind us that our hope must always be in the Lord. But some of us look at troubles as challenges that we must overcome. So we strive with all our might and wisdom to overcome them. Interestingly enough, we often succeed. This poisons our minds into thinking that we can manage life without God. This is one of the main reasons why self-control is needed in prayer. This is also one of the reasons why prayer is commanded, not suggested.