Ezra 9:4

Then were assembled unto me every one that trembled at the words of the God of Israel, those impressed with the terror of Jehovah's possible wrath, because of the transgression of those that had been carried away, of those living in captivity, of the people who had returned with the first company of exiles; and I sat astonied until the evening sacrifice. Ezra foresaw the dangerous results of the condition as reported to him and was overwhelmed with the difficulty of correcting the evil. Mixed marriages are always dangerous, for experience has shown that the believing spouse is more often misled into misbelief and indifference than the unbelieving is brought to the knowledge of the truth.