‘A wife is bound for as long as her husband lives, but if the husband is dead, she is free to be married to whom she will, only in the Lord. But she is happier if she abides as she is, according to my judgment. And I consider that I also have the Spirit of God.'
Finally he deals with a wife whose husband dies. She is now faced again with a choice whether to marry or not. Again the same principles apply. For her to marry is good. There is no sin in that and it could have positive results, as long as it is ‘in the Lord', that is into a genuine Christian marriage. He would not say this about marrying an unbeliever or a nominal Christian. But to dedicate herself solely to Christ's service would be better as long as she can maintain that dedication. If she will have difficulty with this on her own she is better to marry again (1 Timothy 5:11-14).
‘And I consider that I also have the Spirit of God.' This applies to all he has been saying on the subject. Paul is confident that what he says has come because he is being directed by the Holy Spirit. Thus these are not just his own opinions but the word of God.