[quote="fakename, post:8, topic:288218"]
So is that a "yes, it's a good foundation for being sure" answer or a "no, it's not a good foundation for being sure" answer? And plus, this forgets that some people have naturally better memories.
In any case, a person sometimes is not fully sure that he took his medicine, but he does have a good impression that he did it nonetheless and this can be enough to cause certainty.
Would you say that this is a safe way to be sure about things?
Each person needs to "know themselves".
For example --lets take the case of a person who struggles with scruples about their penance. They will often be told "unless your certain you did not do the penance --do not repeat it". To do it only once no matter what fears they may have.
Of lets take someone with OCD --they may want to repeat and repeat ....never feeling that they have done it. They need to address it like the rest of their OCD (we cannot give such advice here ...) and they may be told to do it only once and resist anything further.
Or someone with memory problems-- they will address it the way they do their other memory problems--like use a medicine box for every day of the week. They can for example to their penance right away or if it is a longer one -- keep track of it --or even ask for a different one.
But yes even a person without such struggles can ask --did I do it? if it is simple they can just do it then and there and since they are not dealing with the above --that will be all there is to it. They will go on with their life. If it say a long one or more involved one --they can discuss it with their confessor or of they do not have one -- with the Priest in the next confession.. Penances can be changed for example.
They still intend to do what is needed --they are simply waiting now til the next confession to find out what to do. He may just say -- ok just add an Our Father to todays Penance to cover anything lacking.