This is the third principle for guiding the ordering of our life, or even the fourth. The first is to do everything according to a clear and firm conscience, with a faithful awareness that the deed accords with God's will.
The second is to do everything for the glory of God. This means not only having God's glory in view as our aim, but acting so that God's glory truly comes forth from our deeds.
The third is not to scandalize anyone, whether intentionally or unintentionally. The fourth is to direct everything, both word and deed, toward the salvation of our neighbors.
How far the Apostle was ready to sacrifice everything for the salvation of others can be judged from his prayer. In it he expressed his readiness even to be accursed, if only his brethren might be saved (Rom 9:3).
This disposition, more than anything else, gave him boldness to say, "Be imitators of me, as I also am of Christ."