Sin.

But, we are told, there is ground to fear that, when the body is subjected to the enemy's lust, the insidious pleasure of sense may entice the soul to consent to the sin, and steps must be taken to prevent so disastrous a result. And is not suicide the proper mode of preventing not only the enemy's sin, but the sin of the Christian so allured? Now, in the first place, the soul which is led by God and His wisdom, rather than by bodily concupiscence, will certainly never consent to the desire aroused in its own flesh by another's lust. And, at all events, if it be true, as the truth plainly declares, that suicide is a detestable and damnable wickedness, who is such a fool as to say, Let us sin now, that we may obviate a possible future sin; let us now commit murder, lest we perhaps afterwards should commit adultery? If we are so controlled by iniquity that innocence is out of the question, and we can at best