As we treat our neighbors, so also does God treat us.

Do we forgive our neighbors their trespasses? God also forgives us in His mercy. Do we refuse to forgive? God, too, will refuse to forgive us. As we treat our neighbors, so also does God treat us.  The forgiveness, then, of your sins or unforgiveness, and hence  also your salvation or destruction, depend on you yourself, man.  For without forgiveness of sins there is no salvation. You can see  for yourself how terrible it is.

St. Tikhon of Zadonsk
Journey to Heaven.