Albert Barnes Commentary 1 Corinthians 8:2

"If any man thinketh that he knoweth anything, he knoweth not yet as he ought to know;" — 1 Corinthians 8:2 (ASV)

And if any man think, etc. The connection and the scope of this passage require us to understand this as designed to condemn that vain conceit of knowledge, or self-confidence, which would lead us to despise others or to disregard their interests. "If anyone is conceited about his knowledge, is so vain, proud, and self-confident that he is led to despise others and to disregard their true interests, he has not yet learned the very first elements of true knowledge as he ought to learn them. True knowledge will make us humble, modest, and kind to others. It will not puff us up, and it will not lead us to overlook the real happiness of others." See Romans 11:25.

Any thing. Any matter pertaining to science, morals, philosophy, or religion. This is a general maxim pertaining to all pretenders to knowledge.

He knows nothing yet, etc. He has not known what is most necessary to be known on the subject, nor has he known the true use and design of knowledge, which is to edify and promote the happiness of others. If a man has not learned anything in such a manner as to make it contribute to the happiness of others, it is a proof that he has never learned the true design of the first elements of knowledge.

Paul's design is to induce them to seek the welfare of their brothers. Knowledge, rightly applied, will promote the happiness of all.

And it is true now as it was then, that if a man is a miser in knowledge, as in wealth; if he lives to accumulate, never to impart; if he is filled with a vain conceit of his wisdom, and does not seek to benefit others by enlightening their ignorance and guiding them in the way of truth, he has never learned the true use of science, any more than the man has of wealth who always hoards and never gives.

It is valueless unless it is diffused, as the light of heaven would be valueless unless diffused all over the world, and the waters would be valueless if always preserved in lakes and reservoirs and never diffused over hills and valleys to refresh the earth.