The Deceitfulness of Sin

John Owen again, on the Mortification of Sin in Believers. This is in the Christian Classics Ethereal Library which you can enter on my sidebar, or just begin here for Owen's book on mortification.

In speaking about having a particular lust in the heart (note: lust is the Biblical word that refers to any ungodly desire of the flesh), Owen says:

Consider the danger of it, which is manifold:—
(1.) Of being hardened by the deceitfulness. This the apostle sorely charges on the Hebrews, chap. iii. 12, 13, “Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God. But exhort one another daily, while it is called To-day; lest any of you be hardened through the deceitfulness of sin.” “Take heed,” saith he, “use all means, consider your temptations, watch diligently; there is a treachery, a deceit in sin, that tends to the hardening of your hearts from the fear of God.” The hardening here mentioned is to the utmost, — utter obduration; sin tends to it, and every distemper and lust will make at least some progress towards it. Thou that wast tender, and didst use to melt under the word, under afflictions, wilt grow as some have profanely spoken, “sermon-proof and sickness-proof.” Thou that didst tremble at the presence of God, thoughts of death, and appearance before him, when thou hadst more assurance of his love than now thou hast, shalt have a stoutness upon thy spirit not to be moved by these things. Thy soul and thy sin shall be spoken of and spoken to, and thou shalt not be at all concerned, but shalt be able to pass over duties, praying, hearing, reading, and thy heart not in the least affected. Sin will grow a light thing to thee; thou wilt pass it by as a thing of nought; this it will grow to. And what will be the end of such a condition? Can a sadder thing befall thee? Is it not enough to make any heart to tremble, to think of being brought into that estate wherein he should have slight thoughts of sin? Slight thoughts of grace, of mercy, of the blood of Christ, of the law, heaven, and hell, come all in at the same season. Take heed, this is that thy lust is working towards, — the hardening of the heart, searing of the conscience, blinding of the mind, stupifying of the affections, and deceiving of the whole soul.