“Without carefulness” means “to be free from care or anxiety”, to be torn between two conflicting responsibility. The unmarried Christian, without the commitment of time in caring for spouse and children, can better devote time to serve the Lord “undistracted”. This is not to say that the married person cannot care for the things of God. Rather, the family’s needs requires the commitment of time and resources that the unmarried person can give better over the married person. This does not mean that the unmarried Christian necessarily would make such a sacrifice toward the service of the Lord.