Everyone who has to contend with unbelief should be advised that he ought not to take his own unbelief too seriously. - Karl Barth

Godlessness is not… a possibility, but an ontological impossibility for man. Man is not without, but with God. This is not to say, of course, that godless men do not exist. Sin is undoubtedly committed and exists. Yet sin itself is not a possibility but an ontological impossibility for man. We are actually with Jesus, i.e., with God. this means that our being does not include but excludes sin. To be in sin, in godlessness, is a mode of being contrary to our humanity. For the man who is with Jesus… is with God. If he denies God, he denies himself… He chooses his own impossibility

On the basis of the eternal will of God we have to think of EVERY HUMAN BEING, even the oddest, most villainous or miserable, as one to whom Jesus Christ is Brother and God is Father; and we have to deal with him on this assumption. If the other person knows that already, then we have to strengthen him in the knowledge. If he does no know it yet or no longer knows it, our business is to transmit this knowledge to him.

The person who knows only his side of the argument knows little of that.