"Number"--the exact number, if you know it; as, for example, when we miss Mass we can generally tell exactly the number of times. But when we tell lies, for instance, we may not know the exact number: then we say how often in the day, or that it is a habit with us, etc. "Kinds"--whether they are cursing, or stealing, or lying, etc. "Circumstances which change their nature." In the case of stealing, for example, you need not tell whether it was from a grocery, a bakery, or dry-goods store you stole, for that circumstance does not change the nature of the sin: you have simply to tell the amount you took. But if you stole from a church you would have to tell that, because that is a circumstance that gives the sin of stealing a new character, and makes it sacrilegious stealing. Or if you stole from a poor beggar all he possessed in the world, so that you left him starving, that would be a circumstance making your sin worse, and so you would have to tell it. Therefore you have to tell any circumstance that really makes your sin much worse or less than it seems; all other circumstances you need not tell: they will only confuse you, and make you forget your sins and waste the priest's time. 214 Q. What should we do if we cannot remember the number of our sins? A. If we cannot remember the number of our sins, we should tell the number as nearly as possible, and say how often we have sinned in a day, a week, or a month and how long the habit or practice has lasted. *215 Q. Is our confession worthy if, without our fault, we forget to confess a mortal sin? A. If without our fault we forget to confess a mortal sin, our confession is worthy, and the sin is forgiven; but it must be told in confession if it again comes to our mind. 216 Q. Is it a grievous offense willfully to conceal a mortal sin in confession? A. It is a grievous offense willfully to conceal a mortal sin in confession, because we thereby tell a lie to the Holy Ghost, and make our confession worthless.