Catholics believe that divorce is wrong and that marriage is indissoluble based on biblical passages. However, they believe an annulment is possible if the marriage vows were not sincerely made. Other Christians see divorce as an unfortunate last resort if counseling fails to repair a failing marriage. Non-religious people think divorce should be allowed since marriage is a legal contract. Societal and legislative attitudes toward divorce have liberalized considerably in recent decades but research shows divorce often negatively impacts children.