Jamieson, Fausset and Brown on Ephesians 4:12

12. For--with a view to; the ultimate aim. "Unto."

perfecting--The Greek implies correcting in all that is deficient, instructing and completing in number and all parts.

for--a different Greek word; the immediate object. Compare Ro 15:2, "Let every one ... please his neighbor for his good unto edification."

the ministry--Greek, "ministration"; without the article. The office of the ministry is stated in this verse. The good aimed at in respect to the Church (Ep 4:13). The way of growth (Ep 4:14-16).

edifying--that is, building up as the temple of the Holy Ghost.