For why is my liberty judged by another conscience? (ina ti gar h eleuqeria mou krinetai upo allh suneidhsew;). Supply genhtai (deliberative subjunctive) after ti. Paul deftly puts himself in the place of the strong brother at such a banquet who is expected to conform his conscience to that of the weak brother who makes the point about a particular piece of meat. It is an abridgment of one's personal liberty in the interest of the weak brother. Two individualities clash. The only reason is love which builds up ( Luke 8:2 and all of chapter 1 Corinthians 13:1 ff.). There is this eternal collision between the forces of progress and reaction. If they work together, they must consider the welfare of each other.