From Richard Baxter’s A Christian Directory, page 88,

“Sin is not only a preferring the body before the soul, but it is also an unmercifulness or cruelty against ourselves, both soul and boy, and so is contrary to the true use of the indelible principle of self-love; for it is a wounding and abusing the soul and defiling the body in this life, and casting both on the wrath of God, and into the flames of hell hereafter, or a dangerous venturing them into the way of endless damnation and despair, and a contempt of those insufferable torments. All these parts of malignity and poison are intrinsical to sin, and found in the very nature of it.“