St. Paul exalted the single state above the married state because he believed, like Jesus and in keeping with Jesus' teaching about marriage (Matthew 19:10ff., Luke 20:34ff.), that the world was coming to a sudden end:
Now concerning the matters about which you wrote. It is well for a man not to touch a woman. ... I wish that all were as I myself am. But each has his own special gift from God, one of one kind and one of another. To the unmarried and the widows I say that it is well for them to remain single as I do. ... I mean, brethren, the appointed time has grown very short; from now on, let those who have wives live as though they had none . . . But whoever is firmly established in his heart, being under no necessity but having his desire under control, and has determined this in his heart, to keep her as his betrothed, he will do well. So that he who marries his betrothed does well; and he who refrains from marriage will do better.
-- 1 Corinthians 7, passim
And Jesus answering said unto them, The children of this world marry, and are given in marriage: But they which shall be accounted worthy to obtain that world, and the resurrection from the dead, neither marry, nor are given in marriage: Neither can they die any more: for they are equal unto the angels; and are the children of God, being the children of the resurrection.
-- Luke 20:34ff.
Paul would not have agreed in his own time with this from ours, by one Kevin Shrum, here:
'If marriage implodes then so, too, does a civil, productive society. Any culture that demotes, demeans, demoralizes, diminishes, denigrates, or re-defines marriage does so at its own peril. Cultures that eviscerate marriage will survive, but those same cultures will be, as Plato would argue, mere shadows of the "real thing," of the "real idea." How can we help our neighbors see and hear the truth in this matter of marriage?'
The irony of such statements is that despite the radical teachings of Jesus and Paul about marriage, Christianity went on to conquer the West and recreate its culture in its own image . . . and flourish.