Romanos 9:14

‘What shall we say then? Is there unrighteousness with God? Certainly not.'

Paul first raises the question that might be asked, ‘does this not mean that God is behaving unfairly?' Paul's reply is strong, ‘Is there unrighteousness with God? Certainly not.' God cannot in these cases be accused of unrighteousness, that is of acting contrary to His nature, because we are dealing, not with pure justice, but with questions of mercy and compassion. It is not as though anyone deserved God's favour. The point is that no one does. Thus God is free to give His favour wherever He wills.