1 Corinthians 8:11 - Matthew Poole's English Annotations on the Holy Bible

Through thy knowledge, in this place, is, by occasion of thy knowledge. God hath not given people knowledge that they thereby should be a means to harm and to destroy, but to do good, and to save others; it is a most absurd thing for any to use their knowledge, therefore, to the destruction of others. Shall the weak brother perish? By perish is here meant, be led into sin, by acting contrary to the judgment of his own conscience; for, (as the apostle saith, Romans 14:23): He that doubteth is damned if he eat, for whatsoever is not of faith, that is, done out of a firm persuasion in the party doing that it is lawful, is sin. For whom Christ died; though he be weak, yet if he be a true believer, Christ died for him, and there can be nothing more contrary to the duty of a charitable Christian, than to be a means to damn him whom Christ came down from heaven and died for, that he might save him.