But I speak this by permission. — Better, Now I say this as a permission, and not as a command. As the passage is given in our English version, it might seem as if the Apostle implied that he had no actual command, but only a permission to write this, which is not at all his meaning. What he does say is, that the foregoing instructions are not to be considered as absolute commands from him, but as general permissive instruction, to be applied by each individual according to circumstances.
It has been much discussed as to what part of the previous passage the word “this” refers. It is perhaps best to take it as referring to the leading thought of the whole passage, which is that marriage is allowable, expressed especially in 1 Corinthians 7:2.