1 Corinthians 8:9

Take heed. Knowledge of the truth regarding the nothingness of the idol does not of itself constitute an unlimited excuse for the exercise of the privilege of pleasing oneself without regard for the influence of one’s acts upon others.

Lest. Care is to be taken that the conduct of some, who fully understand the subject, does not lead others, less intelligent in the matter, into a wrong course of action. This is a general principle of Christian behavior, the practical outworking of the golden rule in things that are of minor importance.

Liberty. Gr. exousia, “right,” or “authority,” that is, to eat the meat offered to idols. It is often true that a Christian has the right or authority to do a certain thing, but that it is not wise, or considerate of others, to exercise that right (see on ch. 6:12; cf. ch. 10:23).

Stumblingblock. That is, anything that causes another to fall from the path of truth, and thereby commit sin. There was danger that those whose consciences were not troubled by the act of eating meat offered to idols might cause others to sin by awakening in them an inclination to indulge in conduct that conflicted with their conscientious scruples (see Matt. 18:6-9; Rom. 14:13, 20).

Weak. See on 1 Cor. 8:7; cf. on Rom. 14:1. The believer must always remember that he is his brother’s keeper. It is his duty so to live that no word or deed of his shall in any way make it more difficult for someone else to live in harmony with the will of God. Personal convenience and inclination must not be the first consideration; one must give thought to the effect of his acts upon others.