8. If one professes to abide in Christ, how ought he to walk?

“He that saith he abideth in Him ought himself also so to walk, even as He walked.” 1 John 2:6.

9. What is sin?

“Whosoever committeth sin transgresseth also the law: for sin is the transgression of the law.” 1 John 3:4.

Note.—This text does not say that sin was the transgression of the law, but that it is this, thus demonstrating that the law is still in force in the gospel dispensation. “Whosoever” likewise shows the universality of its binding claims. Whoever of any nation, race, or people commits sin, transgresses the law.

The Great Sacrifice. "Do we then make void the law through faith? God forbid: yea, we establish the law." Rom. 3:31.

10. In what condition are all men?

“For all have sinned, and come short of the glory of God.” Rom. 3:23.

11. How many are included in the “all” who have sinned?