Why does God seem more wrathful in the Old Testament and more loving in the New Testament?

It often seems to us that God in the Old Testament is wrathful, while God in the New Testament is loving. This can give us the impression that the Bible contains two different gods! But when we look closely we see that in both testaments we find God's wrath and His love. This actually makes sense, because wrath is not the opposite of love -- indifference is. God's wrath is on account of His love for us and His concern for injustice, when we mar the image of God in one another. Ultimately, justice and love meet at the cross, through which we have the ability to be forgiven and be reconciled to God.