John Owen, On Why We Must Mortify Sin

“We must be exercising mortification every day, and in every duty. Sin will not die, unless it be constantly weakened. Spare it, and it will heal its wounds, and recover its strength. We must continually watch against the operations of this principle of sin: in our duties, in our calling, in conversation, in retirement, in our straits, in our enjoyments, and in all that we do. If we are negligent on any occasion, we shall suffer by it; every mistake, every neglect is perilous.” (Prophetic Untimeliness)