All duties to neighbor or self are not equally imperious and to fail in them all is not equally evil. Then again, not all sins are committed through pure malice, that is, with complete knowledge and full consent. Ignorance and weakness are factors to be considered in our guilt, and detract from the malice of our sins. Hence two kinds of sin, mortal and venial. These mark the extremes of offense. One severs all relation of friendship, the other chills the existing friendship. By one, we incur God's infinite hatred, by the other, His displeasure. The penalty for one is eternal; the other can be atoned for by suffering. It is not possible in all cases to tell exactly what is mortal and what venial in our offenses. There is a clean-cut distinction between the two, but the line of demarcation is not always discernible. There are, however, certain characteristics which enable us in the majority of cases to distinguish one from the other. First, the matter must be grievous in fact or in intention; that is, there must be a serious breach of the law of God or the law of conscience. Then, we must know perfectly well what we are doing and give our full consent. It must therefore be a grave offense in all the plenitude of its malice. Of course, to act without sufficient reason, with a well-founded doubt as to the malice of the act, would be to violate the law of conscience and would constitute a mortal sin. There is no moral sin without the fulfilment of these conditions. All other offenses are venial. We cannot, of course, read the soul of anybody. If, however, we suppose knowledge and consent, there are certain sins that are always mortal. Such are blasphemy, luxury, heresy, etc. When these sins are deliberate, they are always mortal offenses. Others are usually mortal, such as a sin against justice. To steal is a sin against justice. It is frequently a mortal sin, but it may happen that the amount taken be slight, in which case the offense ceases to be mortal. Likewise, certain sins are usually venial, but in certain circumstances a venial sin may take on such malice as to be constituted mortal. Our conscience, under God, is the best judge of our malevolence and consequently of our guilt. CHAPTER VII. HOW TO COUNT SINS. THE number of sins a person may commit is well-nigh incalculable, which is only one way of saying that the malice of man has invented innumerable means of offending the Almighty--a compliment to our ingenuity and the refinement of our natural perversity. It is not always pleasant to know, and few people try very hard to learn, of what kind and how many are their daily offenses. This knowledge reveals too nakedly our wickedness which we prefer to ignore. Catholics, however, who believe in the necessity of confession of sins, take a different view of the matter. The requirements of a good confession are such as can be met only by those who know in what things they have sinned and how often.