Doubt changes your perspective

Let’s read about how Doubt changes our perspective

A man woke up early in the morning and saw that his axe had disappeared.

He suspected that his neighbour had stolen it. So he kept an eye on him all day.

He found out that his neighbour was good at stealing because he walked like a thief, He whispers like a thief trying to hide something. He was so sure of his scepticism that he decided to return home to change his clothes and go to the judge and complain to him.

But as soon as he entered the house, he found his axe at the door. His wife had moved it when she was cleaning.

The man left the house and watched his neighbour again. He realized that he walks, speaks, and behaves like a noble man. And his judgement was clouded because of the doubt he had.

What was the difference in the first and second time the man looked at his neighbour?
What had caused the man to look at his neighbour differently?