Albert Barnes Commentary 1 Corinthians 13:10

"but when that which is perfect is come, that which is in part shall be done away." — 1 Corinthians 13:10 (ASV)

But when that which is perfect is come. It does come; or it will come. This proposition is couched in a general form. It means that when anything which is perfect is seen or enjoyed, then that which is imperfect is forgotten, laid aside, or vanishes. Thus, in the full and perfect light of day, the imperfect and feeble light of the stars vanishes.

The sense here is that in heaven—a state of absolute perfection—that which is "in part," or which is imperfect, will be lost in superior brightness. All imperfection will vanish. And all that we possess here that is obscure will be lost in the superior and perfect glory of that eternal world. All our present unsatisfactory modes of obtaining knowledge will be unknown. All will be clear, bright, and eternal.