Only What is Revealed
The Torah tells us that הנסתרות לה׳ אלוקינו והנגלות לנו ולבנינו, “that which is hidden, belongs to Hashem, but that which is revealed, is for us and our children.”
This Pasuk is very important in understanding the way of the world. Hashem has His own standard and way that He conducts the world. This is hidden from us, and impossible to grasp.
All that should matter to us, is the realization that He is perfection. His justice is true justice, and it cannot be that there exists anyone more merciful than Him.
We are only able to deal with that which is revealed. It is our responsibility to execute justice to the best of our ability. We base what we do on facts, and upon what is seen.
This applies when it comes to the courts and enforcing the law. And it also applies to interpersonal relationships that we have. Although some people are good at concealing who they really are, it is our duty to draw in the righteous, and distance ourselves, from those who are not.
We must remember our limitations as humans. We must let G-d deal with the hidden, and it is upon us to deal with the revealed.