A.T. Robertson Commentary 1 Corinthians 12:7

"But to each one is given the manifestation of the Spirit to profit withal." — 1 Corinthians 12:7 (ASV)

Manifestation (φανερωσις). Late word, in papyri, in N.T. only here and 2 Corinthians 4:2, from φανεροω, to make manifest (φανερος). Each instance of the whole (verse 6) is repeatedly given (διδοτα, present passive indicative of διδωμ).

To profit withal (προς το συμφερον). See on 6:12; 10:23,33 for Paul's guiding principle in such matters.