There are two basic restrictions on marriage in the Bible: Number one, she should marry a man. Number two, he should be a Christian.
John PiperWhenever your heart starts to be anxious about the future, preach to your heart and say, 'Heart, who do you think you are to be afraid of the future and nullify the promise of God? No, heart, I will not exalt myself with anxiety. I will humble myself in peace and joy as I trust this precious and great promise of God - He cares for me.'
John PiperThe Bible does not oppose or forbid interracial marriages but sees them as a positive good for the glory of Christ.
John PiperHusbands are not Christ. But they are called to be like him. And the specific point of likeness is the husband's readiness to suffer for his wife's good without threatening or abusing her. This includes suffering to protect her from any outside forces that would harm her, as well as suffering disappointments of abuses even from her. This kind of love is possible because Christ died for both husband and wife. Their sins are forgiven. Neither needs to make the other suffer for sins. Christ has borne that suffering. Now as two sinful and forgiven people we can return good for evil.
John Piper