William Burkitt on 1 Corinthians 8:3

Observe, The apostle doth not say, if any man know God; but, if any man love God, the same is known; that is, allowed, accepted, and approved of him. A man may know much of God in this world, and yet God may be ashamed to know him in another world; but the soul that sincerely loves God, is certainly beloved of him, and shall be owned and acknowledged by him.

Now, true love to our neighbour is a good evidence of our sincere love to God; and if we love our neighbour truly, we dare not scandalize our neighbour sinfully, nor offend our Christian brethren. Only here we must take notice, that by offending the weak, is not meant displeasing them; but by offending them, is meant laying a stumbling-block before them, which may occasion their falling into sin.