In these passages Paul tells the Corinthian’s that ‘knowledge makes arrogant, but love edifies.’ As we get to know the Bible better, there is a tendency to become arrogant in our knowledge. This arrogance might become visible when we speak to a fellow believer who is not as knowledgeable as we might be.
Paul illustrated this tendency with an example. The example Paul used was regarding a fellow believer thinking it was a sin to eat meat that was sacrificed to idols. Knowing that eating the meat is not a sin, the stronger believer might influence the weaker believer the eat the meat.
Paul said that if we use our liberty to influence our fellow believer to act in a way that he or she believes is sinful, it is indeed a sin to them. They are acting against their conscience and believe that they are doing wrong.
Therefore, we must not necessarily act according to our knowledge, which gives us freedom. We are rather to act with love and avoid causing another to do what they think is wrong.