Jamieson, Fausset and Brown on 1 Corinthians 13:8

8. never faileth--never is to be out of use; it always holds its place.

shall fail ... vanish away--The same Greek verb is used for both; and that different from the Greek verb for "faileth." Translate, "Shall be done away with," that is, shall be dispensed with at the Lord's coming, being superseded by their more perfect heavenly analogues; for instance, knowledge by intuition. Of "tongues," which are still more temporary, the verb is "shall cease." A primary fulfilment of Paul's statement took place when the Church attained its maturity; then "tongues" entirely "ceased," and "prophesyings" and "knowledge," so far as they were supernatural gifts of the Spirit, were superseded as no longer required when the ordinary preaching of the word, and the Scriptures of the New Testament collected together, had become established institutions.