Reading Jhn 20:22-23 I think it is obvious that;1) The power to forgive sins was being confered by Jesus through the Holy Spirit onto these men by His Breathing on them - He tells them so and to go and use that power,2) people had to confess to these men -otherwise how would they know what sins should be retained or remitted, (there is no indication of a given physic ability- though Peter is shown to have some special discernment from the Spirit - Acts 5:3)3) this was a power given to them by Jesus and through the Holy Spirit, not something they had alone within themselves from reading scriptures or just having a personal relationship with Him. It was something special, and not given to everyone.The only question would seem to be whether or not this ability is then passed on by these men to others. Personally, I choose to believe God would NOT have granted such a gift/charge lightly or that a dispensation such as this ( for forgiveness of sin in this manner) would only be available only to Christians while these men still lived. So in a similar manner to the way Jesus conveyed this power (breathing the Holy Spirit onto men) it is a power still being conveyed today.As for the opposite position, am certain some will site a lack of passages indicating an event such as the one in Jhn 20:22 being conducted by one of the disciples. They will no doubt suggest (even though there is no indication in scripture that this is so) that this condition/state within the Church was temporary. Nothing in Jesus Words in John 20 suggests it would end or just be temporary. Some will even suggest the practice of breathing the Holy Spirit onto men (or objects) as done today is obviously pagan in origin and/or non-biblical. However at the same time, they would be hard pressed to explain why it is not pagan when Jesus does it.As we can only be sure of two names (Thomas and John) as being in the room when this happens am not sure what good it does wondering why Peter or the later Paul (the next two most prolific NT writers) should fail to record themselves doing the same thing for their disciples. None of them did so directly. However, they did record in great detail the desire that their disciples remember, do and teach other men faithfully and exactly ALL the things they taught, did and said. Paul even goes as far as admonishing Timothy to remember and pass on not just scriptures and letters, but things he saw and heard Paul do. So if they obeyed Jesus and did this (retain and remit sins), then this was something Peter and Paul would have been doing and their disciples would have seen them doing it. To me while it is easy to say we do not have those ALL the things (which Paul speaks of with Timothy) detailed for us in scripture and therefore cannot possibly know what it entailed using scripture alone, I think it is rather naive to suggest then that these things must not have been all that important for us now. Still we must concede it was not recorded for us in scripture, that like Jesus, these men conferred this power to remit or retain sins on others. Obviously John 20:22 is important to us or else it would not be there, so what does it mean to us now if we are to believe this power ended with the death of the men in that room?God said His Word goes out and does not return void (Is 55:11). If I am to believe this was a temporary deal for Christians, I fail to see how granting a power to men, just this group of men, and then this order ending is not an example of the Word returning void. We take other commands of Jesus to His disciples as still applying to us today, why not this one?