Psalms 51:4

Psalms 51:4. Against thee, thee only, have I sinned, and done this evil in thy sight:

Oh, what an awful thing, to commit adultery in the sight of God! It is horrible; but what must it be to commit any sin in the sight of God? Will a rebel talk treason in the presence of his king? Most men court the darkness that they may not be seen to do evil; but it is the venom of our sin that we commit it when God is present, and looking on. Ah, me!

Psalms 51:4. That thou mightest be justified when thou speakest, and be clear when thou judgest.

Another judge has to decide by the evidence that is brought before him; but this Judge has seen the evil for himself. It was done before his very eyes, and therefore he is clear when he judges.