"Dear friends, I urge you, as aliens and strangers in the world, to abstain from sinful desires, which war against your soul." - 1 Peter 2:11 (NIV)
"Sin is the ruin and misery of the soul; it is destructive in its nature; and if God should leave it without restraint, there would need nothing else to make the soul perfectly miserable. The corruption of the heart of man is a thing that is immoderate and boundless in its fury; and while wicked men live here, it is like fire pent up by God's restraints, when as if it were let loose it would set on fire the course of nature; and as the heart is now a sink of sin, so, if sin was not restrained, it would immediately turn the soul into a fiery oven, or a furnace of fire and brimstone."
- Jonathan Edwards, A.D. 1741
Q: What is sin?
A: Sin is any want of conformity unto, or transgression of, the law of God.
--- Westminster Shorter Catechism Question 14, A.D. 1647