Every situation has its good and evil.the way we overcome evil is not by resisting evil,but by focusing on the good thing in that situation.So the next time you are having trouble lift your mind to a higher realm of peace and tranquility.Most happy people focus on good things than things that frustrate them,they choose to focus on happy things.People who are helplessly enlsaved by there mind are constantly battling bad thoughts and a plagued mind. 2 corinthians 10:5 tells us
5 casting down imaginations and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ,
This means you must catch every thought that comes into your mind and act as the thought cop and hold to captivity every thought that comes into your mind.