Some people see good all around them, while others see nothing but evil.
What is the difference?
Our souls become filters through which we perceive goodness or evil. The pure (those who have Christ in control of their lives) learn to see goodness and purity even in this evil world. But corrupt and unbelieving people find evil in everything because their evil minds and hearts color even the good they see and hear.
Whatever you choose to fill your mind with will affect the way you think and act.