Matthew Henry on 1 Peter 2:11-12

Even the best of men, the chosen generation, the people of God, need to be exhorted to keep from the worst sins. And fleshly lusts are most destructive to man's soul. It is a sore judgment to be given up to them. There is a day of visitation coming, wherein God may call to repentance by his word and his grace; then many will glorify God, and the holy lives of his people will have promoted the happy change.