We have seen that knowledge can puff-up the mind, creating contempt for those who know not as much, therefore creating schisms and factions in the church. Therefore to avoid such things, the apostle enjoined them to charity, which edifieth.
To edify means “to improve spiritually or morally by instruction or example. Therefore we (the knowledgeable and the ignorant) are enjoined to put on, and manifest charity which edifies.
Actually the effect of charity, which can be stretched into a book need not be overemphasized. Consider the following Eph. 1:2-3,15-16; 1Cor. 12:31-13:1-8