'Whether therefore you eat, or drink, or whatever you do, do all to the glory of God.'
Paul's reply is specific and clear. He points to the positive aspect, the need to do all to the glory of God. His reply is that they must ensure that, whatever they do, even in the eating of meat, they do it to the glory of God. It is not their own liberty and rights that they should be concerned about, but God's rights. Their thoughts should be on what pleases Him and what brings glory to Him. And what pleases Him involves consideration for the effect of the things they do on others. Surely they can see that no glory comes to God in doing something which actually causes harm to others of His people? That is the point, and the thing that has to be taken into account