There are many basis from which we judge, the Law, our feelings, what we have been taught, many things. But the basis of most of our judgments is the very nature we were born with, which is the nature of the sinner, and that nature comes from the tree of the knowledge of good and evil. This knowledge is not from God, but from the fruit of that tree.
When we receive from God His Spirit, we are no longer bound to these ways of judging, but have a new way to see things, and that is by His Spirit of truth. We can see with God's eyes the worth or the right or the wrong of things.
In His love,
vic