Another reason is that the mind is used to judge the people. But we might not know how he thinks and what the mind of man is this, that allow us to determine who is poor.
Another reason is that people have to decide. But we may not know what they think. And the minds of the people that have made us decide that poor people can be difficult.
The heart is one of the reasons used to judge people. But we might not know how he thinks. And the soul of the people that we judge that is not difficult.