1 Corinthians 7:33–34 (ESV)

33 But the married man is anxious about worldly things, how to please his wife,

A married believer must be devoted to his or her spouse, as well as to the Lord. The word worldly is used in the sense of temporary (see 1 Corinthians 7:30b). Married life may present a greater temptation to get carried away by the temporary concerns of this world (see Mark 4:19; Luke 21:34).

In contrast, an unmarried believer is free to devote himself or herself to the Lord alone.