Whether fear is a mortal sin?
Objection 1: It seems that fear is not a mortal sin. For, as stated above (FS, Q[23], A[1]), fear is in the irascible faculty which is a part of the sensuality. Now there is none but venial sin in the sensuality, as stated above (FS, Q[74], A[4]). Therefore fear is not a mortal sin.
Objection 2: Further, every mortal sin turns the heart wholly from God. But fear does not this, for a gloss on Judges 7:3, "Whosoever is fearful," etc., says that "a man is fearful when he trembles at the very thought of conflict; yet he is not so wholly terrified at heart, but that he can rally and take courage." Therefore fear is not a mortal sin.
Objection 3: Further, mortal sin is a lapse not only from perfection but also from a precept. But fear does not make one lapse from a precept, but only from perfection; for a gloss on Dt. 20:8, "What man is there that is fearful and fainthearted?" says: "We learn from this that no man can take up the profession of contemplation or spiritual warfare, if he still fears to be despoiled of earthly riches." Therefore fear is not a mortal sin.
On the contrary, For mortal sin alone is the pain of hell due: and yet this is due to the fearful, according to Apoc. 21:8, "But the fearful and unbelieving and the abominable," etc., "shall have their portion in the pool burning with fire and brimstone which is the second death." Therefore fear is a mortal sin.
I answer that, As stated above (A[1]), fear is a sin through being inordinate, that is to say, through shunning what ought not to be shunned according to reason. Now sometimes this inordinateness of fear is confined to the sensitive appetites, without the accession of the rational appetite's consent: and then it cannot be a mortal, but only a venial sin. But sometimes this inordinateness of fear reaches to the rational appetite which is called the will, which deliberately shuns something against the dictate of reason: and this inordinateness of fear is sometimes a mortal, sometimes a venial sin. For if a man through fear of the danger of death or of any other temporal evil is so disposed as to do what is forbidden, or to omit what is commanded by the Divine law, such fear is a mortal sin: otherwise it is a venial sin.
Reply to Objection 1: This argument considers fear as confined to the sensuality.
Reply to Objection 2: This gloss also can be understood as referring to the fear that is confined within the sensuality. Or better still we may reply that a man is terrified with his whole heart when fear banishes his courage beyond remedy. Now even when fear is a mortal sin, it may happen nevertheless that one is not so wilfully terrified that one cannot be persuaded to put fear aside: thus sometimes a man sins mortally by consenting to concupiscence, and is turned aside from accomplishing what he purposed doing.
Reply to Objection 3: This gloss speaks of the fear that turns man aside from a good that is necessary, not for the fulfilment of a precept, but for the perfection of a counsel. Such like fear is not a mortal sin, but is sometimes venial: and sometimes it is not a sin, for instance when one has a reasonable cause for fear.
Whether fear excuses from sin?
Objection 1: It seems that fear does not excuse from sin. For fear is a sin, as stated above (A[1]). But sin does not excuse from sin, rather does it aggravate it. Therefore fear does not excuse from sin.
Objection 2: Further, if any fear excuses from sin, most of all would this be true of the fear of death, to which, as the saying is, a courageous man is subject. Yet this fear, seemingly, is no excuse, because, since death comes, of necessity, to all, it does not seem to be an object of fear. Therefore fear does not excuse from sin.
Objection 3: Further, all fear is of evil, either temporal or spiritual. Now fear of spiritual evil cannot excuse sin, because instead of inducing one to sin, it withdraws one from sin: and fear of temporal evil does not excuse from sin, because according to the Philosopher (Ethic. iii, 6), "one should not fear poverty, nor sickness, nor anything that is not a result of one's own wickedness." Therefore it seems that in no sense does fear excuse from sin.
On the contrary, It is stated in the Decretals (I, Q[1], Cap. Constat.): "A man who has been forcibly and unwillingly ordained by heretics, has an ostensible excuse."
I answer that, As stated above (A[3]), fear is sinful in so far as it runs counter to the order of reason. Now reason judges certain evils to be shunned rather than others. Wherefore it is no sin not to shun what is less to be shunned in order to avoid what reason judges to be more avoided: thus death of the body is more to be avoided than the loss of temporal goods. Hence a man would be excused from sin if through fear of death he were to promise or give something to a robber, and yet he would be guilty of sin were he to give to sinners, rather than to the good to whom he should give in preference. On the other hand, if through fear a man were to avoid evils which according to reason are less to be avoided, and so incur evils which according to reason are more to be avoided, he could not be wholly excused from sin, because such like fear would be inordinate. Now the evils of the soul are more to be feared than the evils of the body. and evils of the body more than evils of external things. Wherefore if one were to incur evils of the soul, namely sins, in order to avoid evils of the body, such as blows or death, or evils of external things, such as loss of money; or if one were to endure evils of the body in order to avoid loss of money, one would not be wholly excused from sin. Yet one's sin would be extenuated somewhat, for what is done through fear is less voluntary, because when fear lays hold of a man he is under a certain necessity of doing a certain thing. Hence the Philosopher (Ethic. iii, 1) says that these things that are done through fear are not simply voluntary, but a mixture of voluntary and involuntary.
Reply to Objection 1: Fear excuses, not in the point of its sinfulness, but in the point of its involuntariness.
Reply to Objection 2: Although death comes, of necessity, to all, yet the shortening of temporal life is an evil and consequently an object of fear.
Reply to Objection 3: According to the opinion of Stoics, who held temporal goods not to be man's goods, it follows in consequence that temporal evils are not man's evils, and that therefore they are nowise to be feared. But according to Augustine (De Lib. Arb. ii) these temporal things are goods of the least account, and this was also the opinion of the Peripatetics. Hence their contraries are indeed to be feared; but not so much that one ought for their sake to renounce that which is good according to virtue.