Some helpful theological direction from Calvin, commenting on James 1.15, with regard to the intrinsic wickedness of evil thoughts, which is particularly poignant in this day where many of our professing brethren are calling lusts "brokenness," instead of sinful, thus mitigating the guilt and shame of them, and discouraging the more hearty mortification thereof (Commentaries on the Catholic Epistles, p. 290):
Then when lust hath conceived. He first calls that lust which is not any kind of evil affection or desire, but that which is the fountain of all evil affections; by which, as he shews, are conceived vicious broods, which at length break forth into sins. It seems, however, improper, and not according to the usage of Scripture, to restrict the word sin to outward works, as though indeed lust itself were not a sin, and as though corrupt desires, remaining closed up within and suppressed, were not so many sins. But as the use of a word is various, there is nothing unreasonable if it be taken here, as in many other places, for actual sin.
And the Papists ignorantly lay hold on this passage, and seek to prove from it that vicious, yea, filthy, wicked, and the most abominable lusts are not sins, provided there is no assent; for James does not shew when sin begins to be born, so as to be sin, and so accounted by God, but when it breaks forth. For he proceeds gradually, and shews that the consummation of sin is eternal death, and that sin arises from depraved desires, and that these depraved desires or affections have their root in lust. It hence follows that men gather fruit in eternal perdition, and fruit which they have procured for themselves.
By perfected sin, therefore, I understand, not any one act of sin perpetrated, but the completed course of sinning. For though death is merited by every sin whatever, yet it is said to be the reward of an ungodly and wicked life. Hence is the dotage of those confuted, who conclude from these words, that sin is not mortal until it breaks forth, as they say, into an external act. Nor is this what James treats of; but his object was only this, to teach that there is in us the root of our own destruction.
And the Papists ignorantly lay hold on this passage, and seek to prove from it that vicious, yea, filthy, wicked, and the most abominable lusts are not sins, provided there is no assent; for James does not shew when sin begins to be born, so as to be sin, and so accounted by God, but when it breaks forth. For he proceeds gradually, and shews that the consummation of sin is eternal death, and that sin arises from depraved desires, and that these depraved desires or affections have their root in lust. It hence follows that men gather fruit in eternal perdition, and fruit which they have procured for themselves.
By perfected sin, therefore, I understand, not any one act of sin perpetrated, but the completed course of sinning. For though death is merited by every sin whatever, yet it is said to be the reward of an ungodly and wicked life. Hence is the dotage of those confuted, who conclude from these words, that sin is not mortal until it breaks forth, as they say, into an external act. Nor is this what James treats of; but his object was only this, to teach that there is in us the root of our own destruction.
