It is important to note that never fails does not refer to success. Love is not a magic key that Christians use to unlock every opportunity and guarantee every endeavor. Love is not a spiritual formula that, faithfully applied, automatically fulfills our desires and produces human success. Love does not always win, at least not in the usual sense. Jesus Christ was love incarnate, yet He did not by His perfect love succeed in winning every person to Himself. He was ridiculed, maligned, denied, rejected, and crucified. Paul could be called the apostle of love, yet he did not leave a trail of perfect successes wherever he ministered. He was persecuted, arrested, beaten, imprisoned, and, like his Lord, put to death because of what he said and did in love.
On the other hand, whenever and wherever Christians are successful in their living and ministering, it will always be through love. Because love does not overpower human will, we cannot always accomplish our purposes, no matter how loving, spiritual, and self-less we may be. But no godly work can be accomplished without love. Success will not always be a part of love, but love will always be a part of true spiritual success
MacArthur, J. (1996). 1 Corinthians (358). Chicago: Moody Press.